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
First local anesthetic used in clinical anesthesia was : 
Select and explain. 
A. Bupivacaine, B. Procaine, C. Lidocaine, D. Cocaine
D: Cocaine
Answer: D: Cocaine 
Explanation: None