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
Size of graffian follicle is: 
Select and explain. 
A. 2mm, B. 3mm, C. 4mm, D. 6mm
D: 6mm
Answer: D: 6mm 
Explanation: 6mm