This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Surgery
[{'content': 'Most radio resistant phase in cell cycle: \nSelect and explain. \nA. G1, B. Early S, C. Late S, D. G2', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radiation energy is absorbed by tissue causing ionization or excitation, which are responsible for various biological effects. Susceptibility of various phases of cell cycle of radiation: G2M>M>G1> early S> late S phase Phase of cell cycle Comment G2M>G2 * Most sensitive to radiation End of S phase * Most resistant to radiation G1 * Radiation exposure leads to chromosomal aberration G2 * Radiation exposure leads to chromatid aberration', 'role': 'assistant'}]