单项选择题

In pH=10, 37 ℃,AKP catalyzes the hydrolysis of disodium phenyl phosphate withliberation of phenol and disodium hydrogen phosphate. Phenol canreact with the 4-aminoantipyrene in the presence of potassiumferricyanate of alkaline medium as an oxidizing regent to form aquinone compound with ( )color.

A.blue
B.green
C.red
D.yellow
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