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
Sphincter urethrae is present in 
Select and explain. 
A. Prostatic urethrae, B. Spongy urethrae, C. Membranous urethrae, D. Penile urethrae
D: Penile urethrae
Answer: D: Penile urethrae 
Explanation: 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