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: Biochemistry
Which among the following is the function of Seoli cells? 
Select and explain. 
A. Testosterone secretion, B. Seminal fluid secretion, C. Aid in spermiogenesis, D. All of the above
C: Aid in spermiogenesis
Answer: C: Aid in spermiogenesis 
Explanation: Seoli cells are columnar or pyramidal cells that largely envelop cells of the spermatogenic lineage and function as suppoing cells or nurse cells. Each Seoli cell suppos 30-50 germ cells at various stages of development. Seoli cells have several specific functions within the seminiferous epithelium, mostly involving the blood-testis barrier: Suppo, protection, and nutrition of the developing spermatogenic cells Exocrine and endocrine secretion Phagocytosis Ref: Mescher A.L. (2010). Chapter 21. The Male Reproductive System. In A.L. Mescher (Ed), Junqueira's Basic Histology: Text & Atlas, 12e.