This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'When prevalance increases, which of the following may be decreased- \nSelect and explain. \nA. Incidence, B. Duration, C. Death rate, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is `c' i.e., Death rate o Decreases in death rate may increase in prevalance because of prolongation of life in chronic disease. o Decreases in incidence or duration, causes decrease in prevalance", 'role': 'assistant'}]