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': 'In a stable situation- \nSelect and explain. \nA. Incidence = prevalence x duration, B. Prevalence = Incidence x Duration, C. Incidence = Prevalence + Duration, D. Prevalence = Incidence + Duration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: prevalence refers specifically to all current cases existing at agiven point in time ,or over a period of time in a given population. Prevalence depends on 2 factors,incidence and duration of disease. Given assumption that the population is stable,and incidence and duration are unchanging ,the relationship between incidence and prevalence can be expressed as P=I*D = incidence *mean duration. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 61', 'role': 'assistant'}]