This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Bilirubin is synthesized from \nSelect and explain. \nA. Amino acid, B. Hemoglobin, C. Myoglobin, D. WBCs', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B HemoglobinRef: Quantitative Human Physiology; An Introduction.pg. 432-33* An average weighing adult turns over approx 6 gm of Hb daily* 1 g of Hb yield - 35 mg of Bilirubin* Therefore daily bilirubin formation in an adult is approx 250-350 mg', 'role': 'assistant'}]