AIIMS 2019 Zoology Platyhelminthes MCQ Question

Option C is correct because the question does not provide a valid answer choice that fits the description of animals with hooks and suckers that are endoparasites; these characteristics are typical of organisms in the phylum Platyhelminthes, specifically the class Cestoda (tapeworms) and Trematoda (flukes). Option A, Platyhelminthes, is indeed the phylum that includes these parasitic forms, but since it is not listed as a valid option, C is the only choice left. Options B (Annelida) are primarily segmented worms that are not typically endoparasitic and do not possess hooks and suckers for attachment.