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': 'All float in a saturated salt solution except - \nSelect and explain. \nA. Clonorchis sinensis, B. Feilised eggs of ascarsis, C. Larva of strongyloids, D. Trichuris trichura', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The eggs of clonorchis may be demonstrated in feces or aspirated bile. They do not float in concentrated saline. REF:TEXTBOOK OF MEDICAL PARASITOLOGY;CKJ PANIKER;6TH EDITION;PAGE NO127', 'role': 'assistant'}]