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B
Trematoda
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C
Cestoda
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D
Nematoda
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Solution
The correct option is CCestoda Platyhelminthes are a phylum of simple bilaterian, unsegmented, soft-bodied invertebrate which can be free-living or parasites. Cestoda, Trematoda are parasitic while Turbellaria contains free-living worms. Cestodes are all parasitic and their life histories vary, but typically they live in the digestive tracts of vertebrates as adults, and often in the bodies of other animals as juveniles. Taenia solium and beef Taenia saginata belong to Cestoda.