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: Pharmacology
Phase 1 clinical trial is done for: 
Select and explain. 
A. Drug safety, B. Pharmacodynamics, C. Efficacy, D. Dosing
A: Drug safety
Answer: A: Drug safety 
Explanation: Ans: A. Drug safety(Ref Goodman Gilman 12/e p79; .Katzung 13/e p12, 12/e p75; KDT 7/e p63-64, 6/e p77)Safety, pharmacodynamics & dosing - Tested in Phase 1 clinical trial.Drug safety - Most impoant primary end point.