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: Unknown
[{'content': 'Serum ca& fetoprotein level is elevated in \nSelect and explain. \nA. Dysgerminoma, B. Endodermal cell tumour, C. Immature teratoma, D. Choriocarcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]