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
% of PCOS patients having diabetes mellitus: 
Select and explain. 
A. 50%, B. 30%, C. 20%, D. 10%
D: 10%
Answer: D: 10% 
Explanation: Ans. is d, i.e. 10%Ref: Leon Speroff 8th/ed, p5I7PCOS: Upto 35% exhibit impaired glucose tolerance and upto 10% have diabetes mellitus.In all PCOS patients, a baseline 2-hour OGTT is recommended.