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: Physiology
Which of the following hormonal activity is expected immediately prior to Ovulation? 
Select and explain. 
A. LH surge, B. FSH surge, C. Progestrone surge, D. Estrogen surge
A: LH surge
Answer: A: LH surge 
Explanation: Ovulation occurs due to the effect of increased concentration of LH. In the pre-ovulatory phase of the menstrual cycle, the ovarian follicle will undergo a series of transformations called cumulus expansion, which is stimulated by FSH. This is followed by LH surge.