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
Quiescent cells belong to which phase of cell cycle? 
Select and explain. 
A. G1, B. G0, C. M, D. S
B: G0
Answer: B: G0 
Explanation: To achieve DNA replication and division, the cell goes through a tightly controlled sequence of events known as the cell cycle. The cell cycle consists of G1 (presynthetic), S (DNA synthesis), G2 (premitotic), and M (mitotic) phases. Quiescent cells that have not entered the cell cycle are in the G0 state. Ref: Robbins, 8th edition, Chapter 3.