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: Unknown
[{'content': '20 year old, soft to firm reddish swelling, progressing in size over the precordium. Histopathological examination showed the following.  What could be your possible diagnosis? \nSelect and explain. \nA. Hemangioma, B. Fibroadenoma, C. Lipoma, D. Dermatofibroma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Robbins Pathology. 9th edition. Page. 517\n\xa0\nHemangioma\nThese tumours are slow growing and are generally asymptomatic unless they exert mass effect on sensitive structures.\n\xa0\nMicroscopy\n\nClosely packed spindle cells with spaces containing little blood\nLumens may be thrombosed or organized, hemosiderin present due to rupture\nScant fibrous stroma', 'role': 'assistant'}]