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': 'Susceptibility bias is eliminated by: \nSelect and explain. \nA. Randomization, B. Single blinding, C. Double blinding, D. Matching', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Randomization', 'role': 'assistant'}]