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: Microbiology
[{'content': 'If a patient was immunized with hepatitis B vaccine, which of the following is seen in serum? \nSelect and explain. \nA. HBeAg, B. FIBSAg, C. Anti-HBs antibody, D. Anti-HBe antibody', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Anti-HBs antibody', 'role': 'assistant'}]