This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
During TURP, surgeon takes care to dissect above the verumontonum to prevent injury to 
Select and explain. 
A. External Urethral Sphincter, B. Urethral crest, C. Prostatic Utricle, D. Trigone of bladder
A: External Urethral Sphincter
Answer: A: External Urethral Sphincter 
Explanation: Damage to the external sphincter is avoided provided one uses the verumontanum as a guide to the most distal point of the resection. Reference : page1351 Bailey and Love's sho practice of surgery 25th edition