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(C) The reaction of $o$-phthalaldehyde with a base $(	ext{OH}^-)$ undergoes an intramolecular Cannizzaro reaction.In this reaction,one aldehyde group

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Phthalide

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(C) The reaction of $o$-phthalaldehyde with a base $(	ext{OH}^-)$ undergoes an intramolecular Cannizzaro reaction.In this reaction,one aldehyde group is oxidized to a carboxylate group $(	ext{COO}^-)$ and the other is reduced to a hydroxymethyl group $(	ext{CH}_2	ext{OH})$,forming the salt of $o$-hydroxymethylbenzoic acid (intermediate $A$).Upon acidification $(	ext{H}^+)$ and heating $(\Delta)$,the carboxylic acid group and the hydroxyl group undergo an intramolecular esterification (cyclization) to form a cyclic ester known as phthalide.

Identify the final product of the following reaction sequence:
$o$-Phthalaldehyde $\xrightarrow{\text{OH}^-} A$ $\xrightarrow{\text{H}^+, \Delta} ?$

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Identify the final product of the following reaction sequence:$o$-Phthalaldehyde $\xrightarrow{\text{OH}^-} A$ $\xrightarrow{\text{H}^+, \Delta} ?$