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 border of ischeorectal fossa is formed by? \nSelect and explain. \nA. Gluteus maximus, B. Perineal membrane, C. Pelvic diaphram, D. Obturator internus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Obturator internus Boundries of ischeoanal (ischeorectal) fossa are :- i) Anteriorly :- Posterior border of perineal membrane . ii) Posteriorly :- Gluteus maximus muscle, sacrotuberous ligament. iii) Laterally :- Ischial tuberosity and obturator internus. iv) Medially :- Sphincter ani externus (external anal sphincter) and pelvic diaphragm (levator ani).", 'role': 'assistant'}]