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 serum bilirubin is always bound to albumin, is not filtered by the kidney (not found in the urine) In biliary obstruction or hepatocellular diseases, both conjugated and unconjugated bilirubin accumulate in plasma. In hemolytic jaundice, total plasma bilirubin increases, but the propoion of the unconjugated and conjugated fractions remains unchanged.', 'role': 'assistant'}]