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
Menstruation occurring every 15 daysis : 
Select and explain. 
A. Polymenorrhea, B. Epimenorrhea, C. Cryptomenorrhea, D. Hypomenorrhea
A: Polymenorrhea
Answer: A: Polymenorrhea 
Explanation: Polymenorrhea