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
Maximum tolerated dose of a new drug is evaluated in 
Select and explain. 
A. Phase 4, B. Phase 3, C. Phase 2, D. Phase 1
D: Phase 1
Answer: D: Phase 1 
Explanation: Phase 1 Clinical trials is used to evaluate Maximum tolerated dose (MTD) of a new drug