This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urogenital System, Subject name: Anatomy
[{'content': 'Trigone of urinary bladder develops from: \nSelect and explain. \nA. Endoderm, B. Ectoderm, C. Mesoderm, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) MesodermRef. BDC Vol-2/ 382* Trigone of bladder is formed by the absorption of mesonephric ducts and is mesodermal in origin.', 'role': 'assistant'}]