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': "Chronically lymphoedematous limb ispredisposed to all of the following except - \nSelect and explain. \nA. Thickening of the skin, B. Recurrent soft tissue infections, C. Marjolin's ulcer, D. Sarcoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]