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: Pathology
[{'content': 'Diabetic gangrene is due to: March 2004 \nSelect and explain. \nA. Ischemia, B. Increased blood glucose, C. Altered host defence and neuropathy, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. All of the above', 'role': 'assistant'}]