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
[{'content': 'All cells do not divide at the same rate. Events in which phase of the cell cycle determine when a cell is going to replicate? \nSelect and explain. \nA. M phase, B. G1 phase, C. S phase, D. G2 phase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]