This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'DNA synthesis takes place in which phase of cell cycle? \nSelect and explain. \nA. G1, B. S, C. G2, D. M', 'role': 'user'}, {'content': 'Answer: B \nExplanation: S-phase (synthesis phase) is the pa of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease. Due to the impoance, the regulatory pathways that govern this event in eukaryotes are highly conserved. Ref-Sathyanarayana 4/e p388', 'role': 'assistant'}]