This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
[{'content': 'Anal canal is NOT supplied by \nSelect and explain. \nA. Superior rectal aery, B. Inferior rectal aery, C. Median sacral aery, D. Middle rectal aery', 'role': 'user'}, {'content': "Answer: D \nExplanation: Middle rectal aery supplies the rectum, but 'not' the anal canal.", 'role': 'assistant'}]