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: Surgery
[{'content': 'Post operative radiotherapy in breast is given for? \nSelect and explain. \nA. To prevent metastasis, B. Ablation of remnant of cancer tissue, C. To prevent recurrence, D. Prevents distal metastasis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. To prevent recurrence", 'role': 'assistant'}]