This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Melanoma of anal canal \nSelect and explain. \nA. Presents with bleeding, B. AP resection gives better result then local excision, C. Local recurrence at same site, D. Radiosensitive', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Malignant melanoma of the anus is very rare and usually presents as a bluish-black soft mass that may mimic a thrombosed external pile, although it may be amelanotic.The prognosis, irrespective of treatment, is extremely poor. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1269', 'role': 'assistant'}]