<prompt> Prophobilinogen in urine produces pink colour with which of the following reagent?Fouchets reagentBenedicts reagentSodium nitroprusideEhrlichs aldehyde reagent  <response>: Prophobilinogen, urobilinogen and stercobilinogen reacts with Ehrlichs aldehyde reagent to form red colour. Ref: Vasudevan Biochemistry, 4th Edition, Pages 256, 493 