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: Dental
[{'content': 'Framingham Heart Study is an example of : \nSelect and explain. \nA. Case control study, B. Cohort study, C. Cross-sectional study, D. Interventional study', 'role': 'user'}, {'content': 'Answer: B \nExplanation: FRAMINGHAM HEART STUDY:\n\nIs a classical example of cohort study\nInitiated in 1948 by US Public Health Service at Framingham, a town in Massachusetts, USA\n\nAim: To study the relationship of risk factors (serum cholesterol, blood pressure, weight,smoking) to the subsequent development of cardiovascular diseases.', 'role': 'assistant'}]