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': 'Bias can be eliminated by all except? \nSelect and explain. \nA. Matching, B. Blinding, C. Randomization, D. Multivariate analysis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Multivariate analysis Matching eliminates confounding bias Blinding eliminates subject, investigator and analyzer bias, depending on the type of blinding. Randomization elminates selection (Investigator) bias and confounding bias.", 'role': 'assistant'}]