This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
[{'content': 'Incidence of a disease is 4 per 1000 of population with duration of 2 years. Calculate the prevalence? \nSelect and explain. \nA. 8/1000, B. 4/1000, C. 2/1000, D. 6/1000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Prevalence = (Incidence Rate) x (Average Duration of Disease)', 'role': 'assistant'}]