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': 'Diabetic gangrene is due to - \nSelect and explain. \nA. Ischemia, B. Increased blood glucose, C. Altered defense by host and neuropathy, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All of the above", 'role': 'assistant'}]