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': 'Mondor’s disease is \nSelect and explain. \nA. Superficial thrombophlebitis of breast, B. Fat necrosis in breast, C. Postradiation breast and arm edema, D. Skin infection over the breast', 'role': 'user'}, {'content': "Answer: A \nExplanation: Mondor's disease is thrombophlebitis of the superficial veins of the breast and anterior chest wall although it has also been encountered in the arm.\nMONDOR’S DISEASE In the absence of injury or infection, the cause of thrombophlebitis - like that of spontaneous thrombophlebitis in other sites - is obscure.\nThe pathognomonic feature is a thrombosed subcutaneous cord, usually attached to the skin.\nWhen the skin over the breast is stretched by raising the arm, a narrow, shallow subcutaneous groove alongside the cord becomes apparent.\nThe differential diagnosis is lymphatic permeation from an occult carcinoma of the breast. The only Rx required is restricted arm movements, and it subsides within a few months without recurrence, complications or deformity", 'role': 'assistant'}]