## **Core Concept**
The patient's presentation with acute onset jaundice and raised aminotransferases along with HBsAg positivity suggests an acute hepatitis B infection. HBsAg (Hepatitis B surface antigen) is a marker of hepatitis B virus (HBV) infection. The presence of HBsAg indicates that the patient is infectious.

## **Why the Correct Answer is Right**
In acute hepatitis B infection, we typically expect to see HBsAg, IgM anti-HBc (Immunoglobulin M antibody to hepatitis B core antigen), and sometimes HBeAg (Hepatitis B e-antigen) which indicates viral replication and high infectivity. Anti-HBs (antibody to hepatitis B surface antigen) usually appears later in the course of infection, often after the disappearance of HBsAg, indicating recovery and immunity. Therefore, the presence of anti-HBs along with HBsAg would be unusual in the acute phase.

## **Why Each Wrong Option is Incorrect**
- **Option A:** IgM anti-HBc is expected in acute hepatitis B infection, as it is an early marker of acute infection.
- **Option B:** HBeAg can be present in acute hepatitis B, especially if the patient is in the viral replication phase.
- **Option C:** HBV DNA can be detected in acute hepatitis B infection, indicating viral replication.
- **Option D:** Anti-HBs is the correct answer because it is **least likely** to be found alongside HBsAg in acute hepatitis B infection. Anti-HBs typically appears later, signifying recovery.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is the serological window in hepatitis B, where HBsAg has disappeared but anti-HBs has not yet appeared, which can sometimes cause diagnostic confusion. However, in acute infection, the presence of IgM anti-HBc helps differentiate it from a chronic infection or vaccination-induced immunity.

## **Correct Answer:** D. Anti-HBs.