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 TH EFOLLOWING DRUGS ACT BY INHIBITING DNS REPLICATION ? \nSelect and explain. \nA. 6-MERCAPTOPURINE, B. ACTINOMYCIN D, C. ASPARAGINASE, D. MITOMYCIN C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: REF : KD TRIPATHI 8TH ED', 'role': 'assistant'}]