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': 'Presence of more than two germ cell layer in a tumor is called : \nSelect and explain. \nA. Dysgerminoma, B. Teratoma, C. Theca cell tumor, D. Seminoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Teratoma', 'role': 'assistant'}]