This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disease Causation, Measurements, Milestones, Subject name: Social & Preventive Medicine
If a new effective treatment is initiated for a communicable disease and all the other factors remain the same, which of the following is most likely to happen? 
Select and explain. 
A. Incidence will not change, B. Prevalence will change but incidence will not change, C. Neither incidence nor prevalence will change, D. Incidence and prevalence both will change
D: Incidence and prevalence both will change
Answer: D: Incidence and prevalence both will change 
Explanation: In an infectious disease case, as the prevalence comes down, the number of infective people in the community also comes down and hence incidence also comes down.