This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Venous Disorders, Subject name: Surgery
[{'content': 'Description of C4b of CEAP Classification for chronic venous disorders is? \nSelect and explain. \nA. Telangiectasia or reticular veins, B. Active venous ulcer, C. Lipodermatosclerosis, D. Oedema', 'role': 'user'}, {'content': 'Answer: C \nExplanation: According to CEAP( Clinical-Etiology-Anatomy-Pathophysiology ) C0 :no signs of venous disease C1:telangectasia or reticular veins C2 : varicose veins. C3 : oedema C4a: pigmentation or eczema C4b: lipodermatosclerosis or atrophie blanche C5 : healed venous ulcer C6 : active venous ulcer', 'role': 'assistant'}]