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 phase of the cell cycle is resistant to most chemotherapeutic agents, i.e., those that are classified as phase-specific? \nSelect and explain. \nA. G0, B. G1, C. G2, D. M', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]