This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': "Serological marker of infectivity of Hepatitis 'B' is - \nSelect and explain. \nA. HBsAg, B. HBeAg, C. IgM anti Hbc, D. HBcAg", 'role': 'user'}, {'content': 'Answer: B \nExplanation: HBeAg presence indicates high infectivity&indicator of active viral application REF:<\\p> ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.547', 'role': 'assistant'}]