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: Pathology
Which one of the following is not used as a Tumor Marker in Testicular tumors: 
Select and explain. 
A. AFP, B. LDH, C. HCG, D. CEA
D: CEA
Answer: D: CEA 
Explanation: CEA