The animals with bilateral symetry in young stage and radial pentamerous symmetry in the adult stage belong to the phylum

Mollusca

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Cnidaria

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Echinodermata

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Annelida

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Solution

The correct option is C Echinodermata
Echinoderms include well known animals, like starfish, sea urchin etc. The larvae of echinoderms have bilateral symmetry but this is lost during metamorphosis, when their bodies are reorganized and develop the characteristic radial symmetry of the echinoderm, typically pentamerism. Hence, option C is correct.

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