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
Saturated salt solution concentrates eggs of all, except- 
Select and explain. 
A. Unfeilized egg of ascaris, B. Trichuris, C. Hymenolepsis nana, D. Enterobius vermicularis
A: Unfeilized egg of ascaris
Answer: A: Unfeilized egg of ascaris 
Explanation: Helminth eggs floating in saturated salt solution: Hell FATE Hell-Helminth,H.nana F-Feilised eggs of Ascaris A-Ancylostoma duodenale T-Trichuris trichiura E-Enterobius vermicularis