This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Bilirubin is absent in urine because it is - \nSelect and explain. \nA. Distributed in the body fat, B. Conjugated with glucoronide, C. Not filterable, D. Lipophilic', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Unconjugated bilirubin cannot be excreted in urine because:-\n\n(i)\xa0It is lipophilic (lipid soluble) but not water soluble, i.e. it is hydrophobic\xa0\n(ii) It is tightly bound to albumin, thus cannot be filtered at glomeruli.', 'role': 'assistant'}]