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
Predisposing factors for chronic limb ischaemia are all except 
Select and explain. 
A. Diabetes mellitus, B. Hyperbilirubinemia, C. Hyperlipidemia, D. Renal insufficiency
B: Hyperbilirubinemia
Answer: B: Hyperbilirubinemia 
Explanation: Risk factors for chronic limb ischaemia :

Age.
Smoking.
Hyper homocystinemia.
Diabetes.
Renal insufficiency.
Dyslipidemia.