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': 'Which one of the following statements is true of cystosarcoma phylloides- \nSelect and explain. \nA. It is a malignant tumour, B. It often metastasises to axillary nodes, C. It is usually bulky and may fungate through the skin, D. It is treated by radical mastectomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]