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': 'Site of diabetic foot ulcer \nSelect and explain. \nA. Medial Malleolus, B. Lateral malleolus, C. Heel, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e. Heel "Diabetic ulcers commonly result from decreased protective sensation. Diabetic ulcers are usually found on the plantar surface of the foot over the metatarsal heads or heel." - Sabiston.', 'role': 'assistant'}]