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': 'Allocation concealment is not possible in a research study conducted on the effects of Risperodone at NIMHANS, Bangalore. Selection bias in a study can be eliminated by which of the following procedures? \nSelect and explain. \nA. Randomization, B. Single blinding, C. Double blinding, D. Matching', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Two strategies are used to reduce selection bias: allocation concealment and randomization. The ideal strategy to eliminate selection bias is randomization.', 'role': 'assistant'}]