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': 'During growth factor-induced cellular regeneration, which transition during cell cycle is controlled by the phosphorylation of the retinoblastoma protein: \nSelect and explain. \nA. G0 to Gl, B. Gl to S, C. S to G2, D. G2 to M', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rb proteins control any extremely impoant check point, the Gi to S transition during the cell cycle. The other checkpoints are regulated by a distinct set of proteins.', 'role': 'assistant'}]