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
Which of the following describes stage 3 Limb ischemia as per Fontaine classification 
Select and explain. 
A. Well compensated intermittent claudication, B. Poorly compensated intermittent claudication, C. Rest pain, D. Ischemic ulcer
C: Rest pain
Answer: C: Rest pain 
Explanation: Fontaine classification of limb ischaemia :

Stage 1 : No clinical symptoms.
Stage 2 : Intermittent claudication.

2a : Well - compensated  - Can walk > 200 metres.
2b : Poorly compensated - Walk only < 200 metres.

Stage 3 : Rest pain.
Stage 4 : Gangrene, ischaemic ulcer.