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': 'Nematodes are differentiated from other worms by - \nSelect and explain. \nA. Segmentation absent, B. Separate celomic cavity, C. Sexes separate, D. They are cylindrical', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nematodes are helminths which belong to phylum Nematoda.They are elongated ,bilaterally symmetrical,cylindrical,unsegmented worms with tapering ends.They resemble eaworm.(refer pgno:136 baveja 3 rd edition)', 'role': 'assistant'}]