<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .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,  <response>: This is a question asking about interpreting hepatitis B serology to determine if a patient has immunity to hepatitis B virus. The key is to identify which antibody indicates immunity. HBsAg indicates active infection. HBcAb indicates past or current infection.HBeAg and HBeAb relate to viral replication.The correct answer is HBsAb, which indicates immunity from prior vaccination or recovery from infection.B: HBsAb 