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 among the following diagnostic technique is confirmatory for Lymphangiosarcoma \nSelect and explain. \nA. Lymphangiography, B. Ultrasonography, C. Skin biopsy, D. Lymphoscintigraphy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Skin or nodule biopsy is confirmative for diagnosis of Lymphangiosarcoma.', 'role': 'assistant'}]