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: Pathology
[{'content': 'Cells are most radiosensitive in: \nSelect and explain. \nA. S-phase, B. M-phase, C. G1-phase, D. G0–phase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cells are most radiosensitive in G2-M interphase.\nCells are least radiosensitive in S phase.', 'role': 'assistant'}]