This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Cells are most radiosensitive in 
Select and explain. 
A. S phase, B. Mphase, C. G1 phase, D. G0 phase
B: Mphase
Answer: B: Mphase 
Explanation: Ref Robbins9/e p140 Cells are most radiosensitive in G2M interphase Cells are least radioactive in Sphase