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
A woman has 20 ml menstrual blood loss every 35 days. She suffers from : 
Select and explain. 
A. Metrorrhagia, B. Menometrorrhagia, C. Oligomenorrhea, D. Menorrhagia
C: Oligomenorrhea
Answer: C: Oligomenorrhea 
Explanation: Oligomenorrhea