A triploblastic animal with bilateral symmetry in larval stage but asymmetry in adult is

Arachnid

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Echinoderm

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Gastropod

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Bivalve

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Solution

The correct option is C Gastropod
Usually bilateral symmetry is found in adult stage and asymmetry in larval stage but in Gastropods an special characteristics is present in their organs called Torsion(present in head to tail) it is from 90 degree to 180 degree and mantle goes above the head and due to this left side of body grow immensely but right side of the body is loss so due to this larval stage has bilateral symmetry but adult body has asymmetry.
Hence, the correct answer is (C)

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