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': 'Relative Risk can be obtained from - \nSelect and explain. \nA. Case study, B. Coho study, C. Case control study, D. Experimental study', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Coho study", 'role': 'assistant'}]