<prompt> 45 years male, blood sample gives purple-brown colour in Ehrich;s solution, the substance isUrobilinogenConjugated bilirubinUnconjugated biliburinHaemosedrin  <response>: BilinogensUBG and SBG react with Ehrlich solution to form redbrown color. Ehrlich;s aldehyde reagentpara dimethylamino benzaldehyde don;t react with any other forms of bilirubin or hemosiderinRef: Textbook of biochemistry for medical students, seventh edition, page no: 279 