This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'A student has just completed her hepatitis B vaccine series. On reviewing her lab studies, you except \nSelect and explain. \nA. Positive test for HBsAg, B. Anti -HBS alone, C. Anti -HBC, D. Antibody against both surface and core antigen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]