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
[{'content': 'Which of the following blocks replication without getting involved in the DNA strand ? a) Cytarabine b) Nalidixic acid c) Ciprofloxacin d) 5–Fluorouracil e) 6–Mercaptopurine \nSelect and explain. \nA. be, B. cd, C. bc, D. bd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]