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': '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: Coho or follow up is a type of analytical study with individuals as a unit of the study. (refer pg no: 62, park 23 rd edition )', 'role': 'assistant'}]