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
All except one describes critical limb ischaemia 
Select and explain. 
A. ABPI = 0.3, B. Ankle SBP < 50 mmHg, C. Toe SBP < 30 mmHg, D. Ankle SBP > 30 mmHg
D: Ankle SBP > 30 mmHg
Answer: D: Ankle SBP > 30 mmHg 
Explanation: Ankle SBP < 50 mmHg describes critical limb ischaemia.