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: Pharmacology
[{'content': 'Which of the following is given at intervals as a pulsatile therapy ? \nSelect and explain. \nA. GnRH, B. GH, C. FSH, D. Estrogen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]