**Core Concept**
The Hepatitis B virus (HBV) is a hepatotropic virus that primarily infects the liver cells (hepatocytes). The virus has a complex life cycle involving several cellular and molecular mechanisms to establish infection and replication.

**Why the Correct Answer is Right**
HBV is not typically present in the lymphatic system, which plays a crucial role in the immune response and the transport of lymph fluid throughout the body. The virus primarily replicates in hepatocytes, and its presence in the lymphatic system is not a characteristic feature of HBV infection. The lymphatic system can, however, play a role in the immune response against HBV, particularly in the context of vaccination and immune-mediated clearance of infected cells.

**Why Each Wrong Option is Incorrect**
**Option A:** Milk can be a potential source of HBV transmission, especially in areas where vaccination coverage is low. Milk can become contaminated with HBV through the milk production process or handling, making it a potential vehicle for transmission.
**Option B:** HBV can be present in sweat, particularly in individuals with high viral loads or acute infection. While sweat is not a common mode of transmission, it is theoretically possible.
**Option C:** HBV can be present in stool, particularly in individuals with acute infection or high viral loads. Stool can become contaminated with HBV through the fecal-oral route, making it a potential vehicle for transmission.

**Clinical Pearl / High-Yield Fact**
HBV can be transmitted through various bodily fluids, including blood, semen, and vaginal fluids. However, it is not typically transmitted through saliva, tears, or urine.

**✓ Correct Answer: D. Lymph**