This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
When prevalence increases, which of the following may be decreased- 
Select and explain. 
A. Incidence, B. Duration, C. Death rate, D. None
C: Death rate
Answer: C: Death rate 
Explanation: when prevalence of a specific disease increases in a community,death rate is considerably decreased.as prevalence is the product of incdence and duration of the illness.from this equation ,incidence reflects the causal factors whereas duration of illness mainly reflects the prognostic factors. ref:park&;s textbook,22 nd ed,pg 74