$A$ compound '$X$' when treated with phthalic anhydride in the presence of concentrated $H_2SO_4$ yields '$Y$'. '$Y$' is used as an acid/base indicator. '$X$' and '$Y$' are respectively:
- ACarbolic acid,Phenolphthalein
- BAnisole,methyl orange
- CSalicylaldehyde,Phenolphthalein
- DToluidine,Phenolphthalein
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