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Assertion (A): The lungs always contain a residual volume of air.
Reason (R) : The respiratory pigment is haemoglobin which has high affinity with $\ce{O2}$.
Reason (R) : The respiratory pigment is haemoglobin which has high affinity with $\ce{O2}$.
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(B) Both A and R are true but R is not the correct explanation of A
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