This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
The cell which forms blood-testis barrier is 
Select and explain. 
A. Spermatogonia, B. Primary spermatocyte, C. Leydig cell, D. Seoli cell
D: Seoli cell
Answer: D: Seoli cell 
Explanation: The blood-testis barrier is a physical barrier between the blood vessels and the seminiferous tubules of the testes.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.