This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Analytical Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Of the different epidemiological study designs available to test the association between risk factor and disease, the best design is of - \nSelect and explain. \nA. Case-control study, B. Ecological study, C. Cohort study, D. Cross-sectional study', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Cohort study Comparison of various epidemiological EcologicalCross sectionalCase controlCohortProbability of selection biasNAMediumHighLowRecall biasNAHighHighLowLoss to follow upNANALowHighConfoundingHighMediumMediumLowTime required.LowMediumMediumHigh. CostLowMediumMediumHighStrength of causal interferenceLowLowMediumHigh", 'role': 'assistant'}]