To which class of dyes does phenolphthalein belong? (a) Azo dyes (b) Nitro dyes (c) Triphenylmet...

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To which class of dyes does phenolphthalein belong?
(a) Azo dyes
(b) Nitro dyes
(c) Triphenylmethane dyes
(d) Phthalein dyes
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