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': 'A patient with amenorrhea had bleeding after giving a trial of progesterone. This implies:a) Sufficient estrogenb) Sufficient progesteronec) Normal ovarian functiond) Intact endometriume) Intact pituitary axis \nSelect and explain. \nA. ade, B. bde, C. abd, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]