Which of following is a true fish?

Dog fish

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Silver fish `

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Star fish

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Whale

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Solution

The correct option is A Dog fish
Elasmobranchii (dog fish) is an alternative name for cartilaginous fish or chondrichthyes. The name refers to the fact that the gill-slits are exposed and not covered by an operculum. Dog fish or scoliodon is a true fish whereas silver fish is arthropods, star fish is echinoderms and whale is a mammal. Thus, the correct answer is option A.

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