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: Pathology
[{'content': 'A 32-year-old woman seeking to become pregnant visits her physician for a pre-pregnancy examination. Routine prenatal laboratory testing demonstrates the following profile: HBsAg (-), anti-HBsAg (+), anti-HBcAg (-), anti-HBeAg (-), and HBV DNA (-). Which of the following likely represents the status of the patient? \nSelect and explain. \nA. Hepatitis B carrier, B. Immunized against hepatitis B, C. Infected and within the "window period", D. Infected with hepatitis B and highly transmissible', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The patient is only positive for antibody to the hepatitis B antigen. This suggests that the patient has been vaccinated for hepatitis B virus (HBV). The vaccine consists of recombinantly produced HBV surface antigen (HBsAg) alone; Antibodies to the core protein (anti-HBcAg) appear during acute illness and between the disappearance of HBsAg and the appearance of anti-HBsAg, the "window period.', 'role': 'assistant'}]