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: Anatomy
[{'content': 'Lateral wall of ischiorectal fossa is formed by all EXCEPT: \nSelect and explain. \nA. Levator ani, B. Obturator internus, C. Ischial tuberosity, D. Obturator fascia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Levator ani with the anal fascia forms the media wall of ischioanal fossa (in the upper pa)', 'role': 'assistant'}]