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': 'True about ureter: \nSelect and explain. \nA. Stas at the hilum, B. Changes its direction at the ischial spine., C. Penetrates the bladder wall without any valve., D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Stas at hilum; B i.e. Changes its direction at the ischial spine; C i.e. Penetrate the bladder wall without any valve', 'role': 'assistant'}]