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
Trigone of bladder is derived from ? 
Select and explain. 
A. Mesonephric duct, B. Paramesonephric duct, C. Absorbed anal membrane, D. Mullerian duct
A: Mesonephric duct
Answer: A: Mesonephric duct 
Explanation: Mesonephric duct