This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
WHICH OF THE FOLLOWING DRUGS ACTS BY INHIBITING TRANSCRIPTION OF DNS TO RNA? 
Select and explain. 
A. RIFAMPICIN, B. NITROFURANTOIN, C. CIPROFLOXACIN, D. OLAXACIN
A: RIFAMPICIN
Answer: A: RIFAMPICIN 
Explanation: RIFAMPICIN INHIBITS DNA DEPENDENT RNA POLYMERASE REF : KD TRIPATHI 8TH ED