This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
If parasites are grown as a culture with unknown bacterial associate, it is called 
Select and explain. 
A. Axenic culture, B. Monoxenic culture, C. Polyxenic, D. Xenic culture
D: Xenic culture
Answer: D: Xenic culture 
Explanation: Pure culture with no bacterial isolates-axenic Unknown bacterial isolate: xenic culture monoxenic culture-culture of parasites grown in association with a single known bacterium. Ref: Arora.Medical parasitology 4th ed pg. 11