Which of the following groups is the correct classification for tapeworms?

• A. Trematode
• B. Acanthocephalan
• C. Nematode
• D. Cestode

Answer: (D)

Tapeworms are parasitic flatworms that belong to the class Cestoda. They have a scolex for attachment and a long chain of segments called proglottids, with no mouth or digestive tract. Nutrients are absorbed directly through their body surface. This combination of being flat, segmented, and lacking a digestive system is characteristic of cestodes, which is why they’re classified as tapeworms.

Trematodes (flukes) are also flatworms but are typically leaf-shaped and possess a digestive system with suckers; acanthocephalans have a retractable proboscis and belong to a separate group; nematodes are roundworms with a complete digestive tract and are not flat or segmented.