
Determine the topic of the question-answer pair.
Question: "what is the function of the vas deferens??";  Answer: "The vas deferens (plural: vasa deferentia), also called ductus deferens ( Latin : "carrying-away vessel"; plural: ductus deferentes), is part of the male anatomy of many vertebrates ; they transport sperm from the epididymis in anticipation of ejaculation ."? Topic: 