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': 'Ankle brachial pressure index is more than 1.3 in all except \nSelect and explain. \nA. Diabetes mellitus, B. Mural calcification, C. Renal insufficiency, D. Critical limb ischaemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In critical Limb ischaemia, ABPI is decreased (0.3).', 'role': 'assistant'}]