This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'Sphincter urethrae is present in \nSelect and explain. \nA. Prostatic urethrae, B. Spongy urethrae, C. Membranous urethrae, D. Penile urethrae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra.The internal sphincter is a continuation of the detrusor muscle and is made of smooth muscle, therefore it is under involuntary or autonomic control. ref - BDC 6e vol2 pg372-376', 'role': 'assistant'}]