This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis, Subject name: Medicine
[{'content': 'In a patient with fulminant liver failure after viral hepatitis, which of the following will not change immediately? \nSelect and explain. \nA. Serum albumin, B. PT, C. Serum bilirubin, D. Serum ammonia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Serum albumin has a half-life of 21 days and levels may be normal in fulminant hepatic failure and will take time to fall.', 'role': 'assistant'}]