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': 'Fibroadenoma of the breast are \nSelect and explain. \nA. Fixed mass, B. Diffuse mass, C. Multiple duffuse mass, D. Solitary mobile mass', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. Solitary mobile mass", 'role': 'assistant'}]