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': 'Hemoglobin dissociates into bilirubin forming the following intermediate product: \nSelect and explain. \nA. Biliverdin, B. Bilirubin diglucuronide, C. Urobilin, D. Stercobilin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]