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': 'Tumor marker secreted in choriocarcinoma is : \nSelect and explain. \nA. CEA, B. Prolactin, C. HCG, D. Alfa feto protein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HCG', 'role': 'assistant'}]