This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNA Replication , Subject name: Biochemistry
DNA replication occurs in which phase of cell cycle - 
Select and explain. 
A. S phase, B. Gl, C. G2, D. M
A: S phase
Answer: A: S phase 
Explanation: Ans. is 'a' i.e., S phase o Repeat from previous sessions.