### History and Significance of Triathlon in the Olympics

**Introduction to Triathlon**
Triathlon is a multi-discipline sport comprising swimming, cycling, and running, contested over various distances. It was introduced to the Olympic Games in 2000 during the Sydney Olympics. The sport has grown in popularity and competitive intensity since its inclusion, drawing participants and fans worldwide. The Olympic triathlon includes a 1.5-kilometer swim, a 40-kilometer bike ride, and a 10-kilometer run.

**Olympic History and Evolution of Triathlon**
Triathlon’s introduction to the Olympic program was marked by excitement and anticipation. The first Olympic triathlons held in Sydney were won by Simon Whitfield from Canada in the men's category and Brigitte McMahon from Switzerland in the women's category. Their victories sparked immense interest in the sport and inspired a new generation of athletes.

**Answer A: Gwen Jorgensen - The First Olympic Triathlon Medalist from the USA**
Gwen Jorgensen is a celebrated figure in the context of American triathlon. Born in Waukesha, Wisconsin, Jorgensen excelled in swimming and running during her high school career and later moved on to triathlon after college. Her ascent in the sport was meteoric.

At the 2012 London Olympics, Jorgensen competed but did not achieve podium success. However, her breakthrough came at the 2016 Rio de Janeiro Olympics. Overcoming several challenges in the previous years, including a flat tire during the London Games, Jorgensen won the gold medal in the Women’s Individual Triathlon. This victory was significant as it marked the first time an American won the gold in this sport. Her win was not just a personal achievement but also a milestone for U.S. triathlon, enhancing the sport's profile within the nation and inspiring many budding athletes.

**Answer B: Nations without Olympic Medalists in Triathlon**
Several countries participate in Olympic triathlon events but have yet to claim a medal. The reasons can be varied - from lack of infrastructure and investment in the sport to the relatively recent adoption of triathlon compared to more established Olympic sports. Developing a competitive triathlon program requires substantial resources, including coaching, sports science, and access to top-tier competition experiences. Nations without an Olympic medal in triathlon are often in the process of developing these resources and increasing the sport's popularity domestically.

For these nations, prominent performances, even those not resulting in a medal, can be catalysts for increased interest and investment in triathlon. Government bodies and sports organizations in these countries might look towards implementing better training facilities, hosting international events, and encouraging youth participation to elevate their competitive presence on the global stage.

**Conclusion**
The story of Olympic triathlon carries narratives of historic firsts and ongoing efforts towards sporting excellence. While athletes like Gwen Jorgensen have reached the pinnacle of triathlon success at the Olympics, several countries continue to strive towards making their mark. Both success stories and ongoing efforts reflect the spirited, diverse, and ever-evolving nature of the Olympic triathlon. Each country's journey in this sport underscores unique challenges and the unifying pursuit of athletic achievement. Whether celebrating a first medal or seeking to inspire the next generation of triathletes, the country-specific responses to Olympic triathlon reflect broader national sporting cultures and aspirations.