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
[{'content': 'Epididymis is covered by: \nSelect and explain. \nA. Tunica vaginalis, B. Tunica vsaculosa, C. Tunica albuginea, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]