This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infections of the genital tract, Subject name: Gynaecology & Obstetrics
Most common cause of vaginal discharge in prepubeal girls is 
Select and explain. 
A. Precocious pubey, B. Urethral prolapse, C. Foreign body, D. Germ cell tumor
C: Foreign body
Answer: C: Foreign body 
Explanation: A foreign body in the vagina is a common cause of vaginal discharge in young girls, which may appear purulent or bloody.Ref: Berek and Novak&;s Gynecology; 15th edition; Chapter 14