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
[{'content': 'Grade 4 clinically in varicose veins is characterised by all exxcept \nSelect and explain. \nA. Eczema, B. Lipodermatosclerosis, C. Ulceration, D. Pigmentation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Clinical grade 4 = skin changes\xa0\n→ Pigmentation\n→ Eczema\xa0\n→ Lipodermatosclerosis', 'role': 'assistant'}]