Assertion (A) : An aqueous solution of \( \mathrm{KOH} \) when for volumetric analysis, its conc...

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Assertion (A) : An aqueous solution of \( \mathrm{KOH} \) when for volumetric analysis, its concentration should be checked before the use.
Reason (R) : On aging, \( \mathrm{KOH} \) solution absorbs atmospheric \( \mathrm{CO}_{2} \).
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If the assertion and reason both are false.
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