This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'In CEAP classification of varicose veins , beer bottle appearance is seen in ? \nSelect and explain. \nA. c1, B. c2, C. C4a, D. C4b', 'role': 'user'}, {'content': 'Answer: D \nExplanation: C4b - lipodermatosclerosis -subcutaneous fibrosis - beer bottle appearance is seen. ref : bailey and love 27th ed', 'role': 'assistant'}]