question: Q:A 52-year-old man with chronic alcoholism presents to an ambulatory medical clinic, where the hepatologist elects to perform comprehensive hepatitis B screening, in addition to several other screening and preventative measures. Given the following choices, which serologic marker, if positive, would indicate the patient has immunity to the hepatitis B virus?? 
  {'A': 'HBsAgrn', 'B': 'HBsAb', 'C': 'HBcAbrn', 'D': 'HBeAg', 'E': 'HBeAb'},