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': 'Which structure passes through Intersigmoidal recess? \nSelect and explain. \nA. Sigmoidal vessels, B. Left Ureter, C. Superior rectal vessels, D. External Iliac artery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Left Ureter passes through Intersigmoidal recess.', 'role': 'assistant'}]