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': 'Which of following is a predisposing factor for developing ovarian hyperstimulation syndrome, during invitro fertilization procedure \nSelect and explain. \nA. Transfer more than 2 embryos, B. High serum estradiol, C. Older maternal age, D. Prior polycystic ovaries', 'role': 'user'}, {'content': 'Answer: B \nExplanation: High serum oestrogen is a risk factor to develop OHSS.', 'role': 'assistant'}]