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: None', 'role': 'assistant'}]