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': 'Following are TVS findings of Adenomyosis except \nSelect and explain. \nA. Transition zone > 12mm thick, B. Endometrial cyst, C. Heterogenous myometrium, D. Subendometrial striations.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Adenomyosis is characterised by myometrial cyst, which is most specific sign.', 'role': 'assistant'}]