This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Perineum 3, Subject name: Anatomy
[{'content': 'FALSE regarding trigone of bladder \nSelect and explain. \nA. Lined by transitional epithelium, B. Mucosa smooth and firmly adherent, C. Internal urethral orifice lies at lateral angle of base, D. Developed from mesonephric duct', 'role': 'user'}, {'content': "Answer: C \nExplanation: Internal urethral orifice lies at the apex (not the lateral angle of base) of urinary bladder. Note: It's the ureters that open at lateral angles. Embryologically, the trigone of the bladder is derived from the caudal end of mesonephric ducts, which is of mesodermal origin (the rest of the bladder is derived from the endodermal urogenital sinus). Urinary bladder is lined by transitional epithelium (including trigone).", 'role': 'assistant'}]