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
Nematodes are differentiated from other worms by - 
Select and explain. 
A. Segmentation absent, B. Separate celomic cavity, C. Sexes separate, D. They are cylindrical
A: Segmentation absent
Answer: A: Segmentation absent 
Explanation: 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)