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 tumour suppressor gene p53 induces cell arrest at 
Select and explain. 
A. S - phase, B. S- G2 phase, C. G2 - M phase, D. G1 - S phase
D: G1 - S phase
Answer: D: G1 - S phase 
Explanation: . G1 aEUR" S phase