$A$ : Antarctic fishes have blubber to withstand sub zero temperatures.
$R$ : Blubber are proteins which allow the freezing of body fluids.

• A

  Assertion and Reason both are correct and also correct explanation.

• B

  Assertion and Reason both are correct but not explanation of assertion.

• C

  Assertion is correct, but Reason is incorrect.

• D

  Both Assertion and Reason are incorrect.