This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Leprotic, Subject name: Pharmacology
Fastest acting drug in leprosy is : 
Select and explain. 
A. Rifampicin, B. Dapsone, C. Clofazimine, D. Ethionamide
A: Rifampicin
Answer: A: Rifampicin 
Explanation: Ans. is 'a' Rifampicin. Harrison says "Rifampicin is the most active agent for leprosy"