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': 'Prevalence of a disease depends upon the following? \nSelect and explain. \nA. Incidence, B. Duration, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Both of the above Prevalence = Incidence 'x mean duration", 'role': 'assistant'}]