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
[{'content': 'WHICH OF THE FOLLOWING DRUGS ACTS BY INHIBITING TRANSCRIPTION OF DNS TO RNA? \nSelect and explain. \nA. RIFAMPICIN, B. NITROFURANTOIN, C. CIPROFLOXACIN, D. OLAXACIN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: RIFAMPICIN INHIBITS DNA DEPENDENT RNA POLYMERASE REF : KD TRIPATHI 8TH ED', 'role': 'assistant'}]