This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
Blood-testis barrier is formed by 
Select and explain. 
A. Seoli cells, B. Leydig cells, C. Epididymis, D. Vas deferens
A: Seoli cells
Answer: A: Seoli cells 
Explanation: The name "blood-testis barrier" is misleading in that it is not a blood-organ barrier in a strict sense, but is formed between Seoli cells of the seminiferous tubule and as such isolates the fuher developed stages of germ cells from the blood. imageref-sciencedirect.com