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B
Ascaris
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C
Pheretima
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D
Leucosolenia
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Solution
The correct option is CLeucosolenia
Parenchymula is the larval stage found in phylum Porifera.
Among all the options, Leucosolenia belongs to phylum Porifera while Hydra belongs to phylum Coelentrata, Ascaris belongs to phylum Nematoda and Pheretima belongs to phylum Annelida.