**Core Concept**
The presence of HBsAg, IgM Anti-HBc, and HBeAg indicates active viral replication and recent infection. These markers are key in distinguishing acute from chronic hepatitis B and assessing infectivity.

**Why the Correct Answer is Right**
HBsAg confirms hepatitis B surface antigen positivity, indicating the virus is present. IgM Anti-HBc is a specific marker of acute infection, not chronic or past exposure. HBeAg is a strong indicator of high viral replication and high infectivity. Together, these three markers point to an acute phase of hepatitis B with active viral shedding and high transmission risk.

**Why Each Wrong Option is Incorrect**
Option A: Chronic hepatitis B with low infectivity is incorrect because IgM Anti-HBc is not seen in chronic cases; chronic infection typically shows IgG Anti-HBc and negative or low-level IgM.
Option C: Chronic hepatitis with high infectivity is incorrect because chronic hepatitis B lacks IgM Anti-HBc, which is a hallmark of acute infection.
Option D: Acute on chronic hepatitis implies a superimposed acute phase on chronic disease, which is not supported by the absence of signs of underlying chronic liver disease or prolonged history.

**Clinical Pearl / High-Yield Fact**
IgM Anti-HBc is the gold standard for diagnosing acute hepatitis B. The combination of HBsAg + IgM Anti-HBc + HBeAg defines acute hepatitis B with high infectivity—this triad must be recognized to avoid misdiagnosing chronic cases.

✓ Correct Answer: B. Acute hepatitis B with high infectivity