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B
Cestoda
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C
Nematoda
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D
Polychaeta
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Solution
The correct option is ATrematoda The platyhelminths are parasitic and non-parasitic flatworms. Cestoda, Trematoda are parasitic while Turbellaria contains free-living worms. Fasciola hepatica which is also known as the common liver fluke is parasites. These flatworms can occur in bile ducts, gallbladder, and liver parenchyma. They feed on blood.