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': 'Ischaemia is characterized by all except \nSelect and explain. \nA. Brittle nails, B. Thickening of skin, C. Muscle wasting, D. Loss of subcutaneous fat', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ischaemia results in thinning of skin.', 'role': 'assistant'}]