This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
Ovulation is associated with sudden rise in - 
Select and explain. 
A. Prolactin, B. Testosterone, C. LH, D. Oxytocin.
C: LH
Answer: C: LH 
Explanation: Ans (c) LH(Ref: Ganong, 25th ed/p.403)A Surge of Luteinizing Hormone (LH) Is Necessary for OvulationExactly around 24-36 hrs before ovulation, estrogen increases the levels of LH. This is an example for a positive feedbackThis LH surge brings about ovulation