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': 'Which epidemiological study gives the most accurate result - \nSelect and explain. \nA. Meta analysis, B. Cross-sectional study, C. Randomized control trial with double blinding, D. Cohort study', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]