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': 'Transitional epithelium is seen in all except - \nSelect and explain. \nA. Collecting duct, B. Calyces, C. Ureter, D. Bladder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]