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': 'Heme is converted to bilirubin mainly in: \nSelect and explain. \nA. Kidney, B. Liver, C. Spleen, D. Bone marrow', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]