This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal Infections, Worm Infestations, Subject name: Social & Preventive Medicine
Marker of Infectivity of Hepatitis B is:- 
Select and explain. 
A. HBsAg, B. HBeAg, C. Anti HBs, D. Anti HBs
B: HBeAg
Answer: B: HBeAg 
Explanation: HBsAg first antigen to appear, epidemio marker ( Australian antigen ) HBcAg - Rarely appears in plasma HBeAg - Marker of infectivity 1st Ab to appearance - Anti HBC Ab - acute hepatitis IgM Anti HBe - Marker of good prognosis Anti HBs - End of communicability and vaccinated.