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
[{'content': 'Calculate the prevalence if incidence is 2 cases per 1000 population per year and mean duration is 4 years- \nSelect and explain. \nA. 8 cases per 1000 population, B. 2 cases per 1000 population, C. 0.5 cases per 1000 population, D. 32 cases per 1000 pupulation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .prevalence is the product of incidence and mean duration ,that is 2* 4 per 1000 population.ref:park&;s textbook,ed22 ,pg no 57', 'role': 'assistant'}]