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': 'Maximum tolerated dose of a new drug is evaluated in \nSelect and explain. \nA. Phase 4, B. Phase 3, C. Phase 2, D. Phase 1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phase 1 Clinical trials is used to evaluate Maximum tolerated dose (MTD) of a new drug', 'role': 'assistant'}]