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': 'Choriocarcinoma commonly metastasize to:\na.Brain\nb. Lung\nc. Vagina\nd. Ovary\ne. Cervix \nSelect and explain. \nA. ab, B. bc, C. cd, D. de', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common sites of metastases in choriocarcinoma are:\nLung (80%) > Vagina (30%) > Pelvis (20%) > Liver (10%) and Brain (10%)', 'role': 'assistant'}]