This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
[{'content': 'The normal range of total serum bilirubin is: \nSelect and explain. \nA. 0.2-1.2 mg/100 ml, B. 1.5-1.8 mg/100 ml, C. 2.0-4.0 mg/100 ml, D. Above 7.0 mg/100 ml', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A.0.2-1.2mg/100mlIncrease in serum bilirubin (2.4mg/dl) leads to jaundice. Bilirubin in serum exists in two forms: Free/unconjugated/indirect bilirubin which is water insoluble. Conjugate/direct bilirubin which is water soluble. Can be estimated by Van den Berg's diazo reaction.", 'role': 'assistant'}]