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
The tumor suppressor gene ? 53 induces cell cycle arrest at: 
Select and explain. 
A. G2- ? phase, B. S-G2 phase, C. G, - S phase, D. G phase
C: G, - S phase
Answer: C: G, - S phase 
Explanation: . G, &; S phase