This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pituitary-Hypothalmic System and Thyroid, Subject name: Pharmacology
[{'content': 'Which of the following is not a GnRH agonist? \nSelect and explain. \nA. Leuprolide, B. Nafarelin, C. Ganirelix, D. Busurelin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: GnRH Agonist Drugs Leuprolide Nafarelin Goserelin Buserelin -They are all injectables. -They all have flare up reaction as adverse effect when given in continuous form GnRH Antagonist Drugs Cetrorelix Ganirelix Abarelix Degarelix -Given as injectables -They do not increase the sex hormone', 'role': 'assistant'}]