This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': '45 years male, blood sample gives purple-brown colour in Ehrich&;s solution, the substance is \nSelect and explain. \nA. Urobilinogen, B. Conjugated bilirubin, C. Unconjugated biliburin, D. Haemosedrin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bilinogens(UBG and SBG) react with Ehrlich solution to form red/brown color. Ehrlich&;s aldehyde reagent(para dimethylamino benzaldehyde) don&;t react with any other forms of bilirubin or hemosiderinRef: Textbook of biochemistry for medical students, seventh edition, page no: 279', 'role': 'assistant'}]