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': 'Metastases from a granulosa cell tumour first in volves : \nSelect and explain. \nA. The liver, B. The opposite ovary, C. The mesentery, D. The mediastinum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The opposite ovary', 'role': 'assistant'}]