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': 'Commonest condition associated with menorrhagia is : \nSelect and explain. \nA. Adenomyosis, B. Fibroid, C. Granulosa cell tumour, D. Polycystic ovary', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fibroid', 'role': 'assistant'}]