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': '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: None', 'role': 'assistant'}]