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
HCG is a tumor marker for : 
Select and explain. 
A. Choriocarcinoma, B. Colon carcinoma, C. Serous cystadenoma, D. Teratoma
A: Choriocarcinoma
Answer: A: Choriocarcinoma 
Explanation: Choriocarcinoma