This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Surgery
Elderly male has 0.5 mm dilated toous vein in the posterior pa of right calf. What is stage as per CEAP classification? 
Select and explain. 
A. C0, B. C1, C. C2, D. C3
B: C1
Answer: B: C1 
Explanation: CEAP classification system: Used for chronic venous disorders (Clinical- etiology- Anatomy- Pathophysiology) CLINICAL (C OF CEAP) CLASSIFICATION (C0-6) Any limb with possible chronic venous disease is first placed into one seven clinical classes (C0-6), according to the objective signs of disease. Class Features 0 No visible or palpable sign of venous disease 1 Telangiectasia, reticular veins, malleolar flare 2 Varicose veins 3 Edema without skin changes 4 Skin changes ascribed to venous disease (e.g., pigmentation, venous eczema, lipodermatosclerosis) 5 Skin changes as defined above with healed ulceration 6 Skin changes as defined above with active ulceration