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: Gynaecology & Obstetrics
Causes of abnormal uterine bleeding prior to menarche are all except 
Select and explain. 
A. Vulvovaginitis, B. Foreign body and abuse, C. Anovulation, D. Precocious puberty
C: Anovulation
Answer: C: Anovulation 
Explanation: AUB resulting from anovulation is seen in adolescent age group, not prior to menarche.