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': 'Trigone of bladder is derived from ? \nSelect and explain. \nA. Mesonephric duct, B. Paramesonephric duct, C. Absorbed anal membrane, D. Mullerian duct', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mesonephric duct', 'role': 'assistant'}]