This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
As per CEAP classification healed venous ulcer is 
Select and explain. 
A. C2, B. C3, C. C4, D. C5
D: C5
Answer: D: C5 
Explanation: CEAP (Clinical-aEtiology-Anatomy-Pathophysiology) classification for chronic venous disorders Clinical classificationC0: no signs of venous disease;C1: telangectasia or reticular veins;C2: varicose veins;C3: oedema;C4a: pigmentation or eczema (some include malleolar flare in this category);C4b: lipodermatosclerosis or atrophie blanche;C5: healed venous ulcer;C6: active venous ulcer.Etiological classificationEc: congenitalEp: primaryEs: secondary (post-thrombotic)En: no venous cause identified.Anatomical classificationAs: superficial veinsAp: perforator veinsAd: deep veinsAn: no venous location identified.Pathophysiological classificationPr: refluxPo: obstructionPr,o: reflux and obstructionPn: no venous pathophysiology identifiable.Ref: Bailey and love pg: 974