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: Biochemistry
[{'content': 'Which of the following blocks DNA replication with getting incorporated in DNA strand: \nSelect and explain. \nA. Cytarabine, B. Nalidixic acid, C. Ciprofloxacin, D. Paclitaxel', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Cytarabine', 'role': 'assistant'}]