This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RCT, Trials, Subject name: Social & Preventive Medicine
[{'content': 'Cessation experiment is a type of: \nSelect and explain. \nA. Coho study, B. Case control study, C. RCT, D. Cross sectional study', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Types of RCTs: Clinical trials Preventive trials Risk factors trials Cessation experiments Trial of etiological agents Evaluation of health services.', 'role': 'assistant'}]