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[A] : Many desert mammals cool the exhal...

[A] : Many desert mammals cool the exhaled air in their noses , before it is expelled out through nostrills .
[R] : The moisture condensation in the nose and is not lost as water vapours along with the exhaled air .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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