Porphobilinogen in urine produces pink colour with-

Ehrlich's aldehyde reagent test is used for porphobilinogen and urobilinogen in urine. It is mainly used in acute intermittent porphyria. About other options Sodium nitroprusside (Rothera's test) → For ketone bodies Benedict's test                                     → Glucose and other reducing sugars in urine Fouchet's (barium sulphate) test         → Bile pigment (bilirubin)