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Assertion :Alveoli are the primary sites for exchange of gases. Reason: All factors in our body are favourable for the diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.
A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C) Assertion is correct but Reason is incorrect
D) Both Assertion and Reason are incorrect