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
[{'content': 'Which egg does not float in a saturated solution of saline ? \nSelect and explain. \nA. Ankylostoma eggs, B. Trichuris eggs, C. Unfeilized egg of Ascaris, D. Feilized egg of Ascaris', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]