This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'Which phase of the cell cycle is most sensitive to radiotherapy: \nSelect and explain. \nA. G2M phase, B. S phase, C. M phase, D. G2 phase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) G2M* Dividing cells are most sensitive to radiotherapy. The phase that is most sensitive to radiation is G2M.Remember the Sensitivity in this Order G2M > G2 > M > G1 > early S > Late S', 'role': 'assistant'}]