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
Not a histological marker for choriocarcinoma: 
Select and explain. 
A. Vill, B. Cytotrophoblast, C. Syncytiotrophoblast, D. Bizarre nuclei
A: Vill
Answer: A: Vill 
Explanation: Vill