This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Venous Insufficiency, Subject name: Surgery
[{'content': 'The following is the commonest site for venous ulcer - \nSelect and explain. \nA. Instep of foot, B. Lower 1/3 leg and ankle, C. Lower 2/3 of leg, D. Middle 1/3 of leg', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Lower 1/3 leg and ankle o Venous ulcers usually lie just proximal to the medial or lateral malleolus.o Venous ulcers are accompanied by lipodermatosclerosis and hemosiderosis (if these are not present then the ulcer is probably not of venous origin).", 'role': 'assistant'}]