Prophobilinogen in urine produces pink colour with which of the following reagent?: (A) Fouchet's reagent, (B) Benedict's reagent, (C) Sodium nitropruside, (D) Ehrlich's aldehyde reagent
Answer is D. Prophobilinogen, urobilinogen and stercobilinogen reacts with Ehrlich's aldehyde reagent to form red colour. Ref: Vasudevan Biochemistry, 4th Edition, Pages 256, 493