This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gluteal Region, Subject name: Anatomy
[{'content': 'Sacrotuberous ligament is pierced by? \nSelect and explain. \nA. Nerve to obturator internus, B. Inferior gluteal artery, C. Superior gluteal artery, D. Sciatic nerve', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans.(b) Inferior gluteal arteryRef: Gray's anatomy 40th ed., chapter 80", 'role': 'assistant'}]