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: Anatomy
Epididymis is covered by: 
Select and explain. 
A. Tunica vaginalis, B. Tunica vsaculosa, C. Tunica albuginea, D. None of the above
A: Tunica vaginalis
Answer: A: Tunica vaginalis 
Explanation: The epididymis is invested by tunica vaginalis, somewhat less closely applied than it is to the testis, except at its posterior margin. Ref: Gray's anatomy 40th edition, Chapter 97.