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': 'Predisposing factors for chronic limb ischaemia are all except \nSelect and explain. \nA. Diabetes mellitus, B. Hyperbilirubinemia, C. Hyperlipidemia, D. Renal insufficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Risk factors for chronic limb ischaemia :\n\nAge.\nSmoking.\nHyper homocystinemia.\nDiabetes.\nRenal insufficiency.\nDyslipidemia.', 'role': 'assistant'}]