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
In a patient with fulminant liver failure after viral hepatitis, which of the following will not change immediately? 
Select and explain. 
A. Serum albumin, B. PT, C. Serum bilirubin, D. Serum ammonia
A: Serum albumin
Answer: A: Serum albumin 
Explanation: Serum albumin has a half-life of 21 days and levels may be normal in fulminant hepatic failure and will take time to fall.