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
[{'content': 'True about trematodes \nSelect and explain. \nA. Two host required, B. Segmented, C. Anus present, D. Body cavity present', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Medically important member of the class Trematoda belongs to subclass Digenea, as they are digenetic, i.e.,\xa0require two hosts. The definitive host in which they pass the sexual or adult stage are mammals, humans or animals, and the intermediate hosts in which they pass their asexual or larval stages are freshwater mollusks or snails.\nTrematodes are unsegmented and have no anus and body cavity.', 'role': 'assistant'}]