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 anaesthesia which was used as clinical anaesthesia was: 
Select and explain. 
A. Lignocaine, B. Lidocaine, C. Cocaine, D. Procaine
C: Cocaine
Answer: C: Cocaine 
Explanation: Cocaine was the first local anaesthesia which was used clinically.