This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Which of the following is not a sphincter in the female urogenital tract - 
Select and explain. 
A. Pubovaginalis, B. External urethral sphincter, C. Internal urethral sphincter, D. Bulbospongiosus
C: Internal urethral sphincter
Answer: C: Internal urethral sphincter 
Explanation: Urogenital sphincters in Females
-        Vaginal sphincters

Bulbospongiosus
Sphincter urethrovaginalis
External urethral sphincter
Pubovaginalis

-        Urinary sphincters

Compressor urethrae
External urethral sphincter
Sphincter urethrovaginalis
Pubourethralis