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
Which phase of clinical trial involves normal human Volunteers: March 2010 
Select and explain. 
A. Phase 0, B. Phase I, C. Phase II, D. Phase III
B: Phase I
Answer: B: Phase I 
Explanation: Ans. B: Phase I