This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
The tumor suppressor gene p 53 induces cell cycle arrest at - 
Select and explain. 
A. G2- M phase, B. S G2phase, C. G1 phase, D. Go phase
C: G1 phase
Answer: C: G1 phase 
Explanation: Harshmohan textbook of pathology 7th edition. In blocking mitotic activity p53 inhibits the cyclins and CDKs and prevent the cell to enter G1 phase transientally. .