This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and Family Planning, Subject name: Social & Preventive Medicine
[{'content': 'Population explosion is defined as population growth rate of more than_______ per year. \nSelect and explain. \nA. 2, B. 1.75, C. 1.8, D. 1.5', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (2.0) (Ref. Park PSM 22nd/pg. 443)Relation between growth rate and population:RatingAnnual rate of growth %Number of years required for the population to double in sizeStationary populationNo growth Slow growthLess than 0.5More than 139Moderate growth0.5 to 1.0139-70Rapid growth1.0 to 1.570-47Very rapid growth1.5 to 2.047-35"Explosive" growth2.0 to 2.535-28"Explosive" growth2.5 to 3.028-23', 'role': 'assistant'}]