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
Ionoising radiation most sensitive in – a) Hypoxiab) S phagec) G2M phased) Activating cell 
Select and explain. 
A. ac, B. cd, C. ad, D. bc
B: cd
Answer: B: cd 
Explanation: Cells that are rapidly growing and dividing are radiosensitive.
G2M phase is most radiosensitive.