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': 'Mefipristone causes __________ on fibroid \nSelect and explain. \nA. Hyperplasia of fibroid, B. Atrophy of fibroid, C. No effect on fibroid, D. Varies with age', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MIfepristone is anti-progestin, which induces atrophy in leiomyomas.', 'role': 'assistant'}]