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
Pituitary down-regulation is done in IVF because of all except 
Select and explain. 
A. To prevent ovarian hyperstimulation syndrome, B. To prevent endogeneous LH surges, C. To prevent premature ovulation, D. To cause oocyte maturation and ovulation
D: To cause oocyte maturation and ovulation
Answer: D: To cause oocyte maturation and ovulation 
Explanation: In IVF, LH surge from pituitary is blocked to allow scheduling of egg collection.