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
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? 
Select and explain. 
A. Randomization, B. Single blinding, C. Double blinding, D. Matching
A: Randomization
Answer: A: Randomization 
Explanation: Two strategies are used to reduce selection bias: allocation concealment and randomization. The ideal strategy to eliminate selection bias is randomization.