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
Which among the following diagnostic technique is confirmatory for Lymphangiosarcoma 
Select and explain. 
A. Lymphangiography, B. Ultrasonography, C. Skin biopsy, D. Lymphoscintigraphy
C: Skin biopsy
Answer: C: Skin biopsy 
Explanation: Skin or nodule biopsy is confirmative for diagnosis of Lymphangiosarcoma.