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: Radiology
[{'content': 'Ionoising radiation most sensitive in – a) Hypoxiab) S phagec) G2M phased) Activating cell \nSelect and explain. \nA. ac, B. cd, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cells that are rapidly growing and dividing are radiosensitive.\nG2M phase is most radiosensitive.', 'role': 'assistant'}]