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
Which of the following inhibit GnRH pulse secretion 
Select and explain. 
A. Insulin, B. Prolactin, C. Thyroxine, D. Oxytocin
B: Prolactin
Answer: B: Prolactin 
Explanation: Prolactin inhibits GnRH pulse secretion. Thus Hyperprolactinemia inhibits ovarian steroidogenesis.