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
Vaginal sphincter is formed by all except 
Select and explain. 
A. Internal urethral sphincter, B. External urethral sphincter, C. Pubovaginalis, D. Bulbospongiosus
A: Internal urethral sphincter
Answer: A: Internal urethral sphincter 
Explanation: Lower genital tract contraction can be carried out by external urethral sphinter, pubo-vaginalis and bulbospongiosus. Females doesnot have internal urethral sphincter.It is anatomical bladder neck sphincter present in males. <img src=" /> Ref - BDC 6e vol2 pg379