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
Marker for seminoma testis is - 
Select and explain. 
A. Alfa - fetoprotein, B. Carcinoembryonic antigens, C. HCG, D. Acid phosphatase
C: HCG
Answer: C: HCG 
Explanation: Normally seminoma cells do not contain AFP and HCG.
"Approximately 15% of seminomas contains syncytiotrophoblasts which secret HCG"  ------ Robbin's 1042
Seminoma is positive for placental alkaline phosphatase and keratin.