This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Epithelium of "Trigone of bladder" is derived from \nSelect and explain. \nA. Vesicourethral Canal, B. Mesoderm, C. Splanchnopleuric Mesoderm, D. Urachus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The urinary bladder is derived from the cranial pa of the vesicourethral canal (endoderm).The epithelium of the trigone is derived from absorbed mesonephric ducts (mesoderm)Reference: Inderbir Singh Embryology; 10th edition; Page no: 292', 'role': 'assistant'}]