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': 'Coho study is a type of - \nSelect and explain. \nA. Clinical trial, B. Analytic study, C. Descriptive study, D. Experimental study', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Analytic study Coho study o Coho study is a type of analytic observational study (like case control study). o Coho study proceeds forward from cause to effect, i.e., disease has not occured in subjects (In contrast to case-control study which proceeds backward from effect to cause).", 'role': 'assistant'}]