This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Which of the following is given at intervals as a pulsatile therapy? 
Select and explain. 
A. GnRH agonist, B. Insulin, C. FSH, D. Estrogen
A: GnRH agonist
Answer: A: GnRH agonist 
Explanation: Only pulsatile exposure to GnRH induces FSH/LH secretion while continuous exposure desensatizes pituitary gonadotropes resulting in loss of Gn release GNRH agonists are usually given in pulsatile manner while antagonists are given in continous manner (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 239)