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
[{'content': 'GnRH agonists used in treatment of leiomyoma suppress progesterone levels after \nSelect and explain. \nA. 2 weeks, B. 3 weeks, C. 4 weeks, D. 5 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: After 1-2 weeks of GnRH agonist therapy, estrogen and progesterone levels start to decline.', 'role': 'assistant'}]