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': 'Fixed time is required for all of the following steps of cell cycle; except \nSelect and explain. \nA. S, B. M, C. G1, D. G2', 'role': 'user'}, {'content': 'Answer: C \nExplanation: •\xa0 The time taken for S, G2\xa0and M phases are similar for most cell types, occupying about 6, 4 and 2 hours respectively.\n•\xa0 The duration of G1\xa0shows considerable variation. It can be as short as 2 hours in rapidly dividing cells like embryonic\xa0tissues or as long as 12 hours in some adult tissues.\n•\xa0 G1 phase is most variable because, in this phase cells are not committed to DNA replication. They can either enter\xa0resting state or progress to next cell division.', 'role': 'assistant'}]