This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 2 (Helminthology), Subject name: Microbiology
[{'content': 'Operculated eggs are seen in: \nSelect and explain. \nA. Nematodes, B. Cestodes, C. Trematodes, D. Protozoa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Operculated eggs are seen in trematodes except schictosoma non operculated eggs are seen in schistosoma', 'role': 'assistant'}]