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
All are vasodilators except - 
Select and explain. 
A. Procaine, B. Lidocaine, C. Cocaine, D. Chlorprocaine
C: Cocaine
Answer: C: Cocaine 
Explanation: Ans. is 'c' i.e., Cocaine