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: Microbiology
Saturated salt solution concentrates eggs of all, except - 
Select and explain. 
A. Unfertilized egg of ascaris, B. Trichuris, C. Hymenolepis nana, D. Echinococcus granulosus
A: Unfertilized egg of ascaris
Answer: A: Unfertilized egg of ascaris 
Explanation: None