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Which among these is the correct combination of aquatic mammals?

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Trygon, whales, seals

Seals, dolphins, sharks

Dolphins, seals, Trygon

Whales, dolphins, seals

answer is B.

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Detailed Solution

Whales, dolphins and seals are aquatic mammals.
(1), (3) Trygon (stingray) is a cartilaginous fish.
(4) Sharks are cartilaginous fish.

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