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': 'What is present in the part of the bone which received radiotherapy - \nSelect and explain. \nA. Response to radiotherapy is good, B. Fast healing, C. More destruction of bone, D. Tumour regression is not affected', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Infection and radiation, both cause bone destruction and predispose to pathological fracture.', 'role': 'assistant'}]