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 35 year old woman with dysmenorrhea and menorrhagia of 6 months duration, showed an enlarged uterus of 20 weeks which was tender, the possible diagnosis is : \nSelect and explain. \nA. Adenomyosis, B. Fibroid, C. Carcinoma endometrium, D. PID', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fibroid', 'role': 'assistant'}]