This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification, Coho Study, Subject name: Social & Preventive Medicine
[{'content': 'Interventional study is used for:- \nSelect and explain. \nA. Hypothesis Formulation, B. Hypothesis Testing, C. Hypothesis Confirmation, D. Hypothesis Manipulation', 'role': 'user'}, {'content': "Answer: C \nExplanation: CLASSIFICATION OF EPIDEMIOLOGICAL STUDIES: 1. OBSERVATIONAL STUDIES: - Descriptive studies - Hypothesis formation is done - Analytical studies - Hypothesis testing is done by coho study/ case-control / cross-sectional/ Ecological studies. 2. EXPERIMENTAL/ INTERVENTIONAL STUDIES: - Hypothesis confirmation is done - Done by clinical trials/ RCT's / Field trials/ Community trials.", 'role': 'assistant'}]