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
Most common cause of puberty menorrhagia: 
Select and explain. 
A. Anovulation, B. Malignancy, C. Endometriosis, D. Bleeding disorder
A: Anovulation
Answer: A: Anovulation 
Explanation: None