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 ulcera) Medial Malleolusb) Lateral malleolusc) Heeld) Head of metatarsale) Head of toes \nSelect and explain. \nA. cd, B. bc, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "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'}]