This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders in Menstruation, Subject name: Gynaecology & Obstetrics
Percentage of females with oligomenorrhea in PCOs: 
Select and explain. 
A. 50%, B. 60%, C. 70%, D. 80%
D: 80%
Answer: D: 80% 
Explanation: Ans. is d, i.e. 80%Ref: Shaw 15th/ed, p370Patients of PCOS develop early oligomenorrhea (87%) or short period of amenorrhea (26%) followed by prolonged periods.