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': 'Corpus f uteum activity is maintained by : \nSelect and explain. \nA. FSH, B. LH, C. Estrogen, D. Progesterone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: LH', 'role': 'assistant'}]