Which component of HBV causes glomerulonephritis
**Core Concept**
HBV (Hepatitis B Virus) is a DNA virus that causes liver inflammation, but it can also have extrahepatic manifestations. The immune complex-mediated glomerulonephritis is one such manifestation, where immune complexes deposit in the glomeruli and cause inflammation.
**Why the Correct Answer is Right**
The correct answer is the component of HBV that can form immune complexes with the host's antibodies and deposit in the glomeruli, leading to inflammation. The envelope proteins of HBV, specifically the surface antigen (HBsAg), can combine with the host's antibodies to form immune complexes. These immune complexes can then deposit in the glomeruli, causing glomerulonephritis. This is an example of type III hypersensitivity reaction.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because the core antigen of HBV is not directly involved in the formation of immune complexes that cause glomerulonephritis.
**Option B:** This is incorrect because the DNA of HBV is not directly involved in the formation of immune complexes that cause glomerulonephritis.
**Option C:** This is incorrect because the precore antigen of HBV is not directly involved in the formation of immune complexes that cause glomerulonephritis.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that HBV can cause extrahepatic manifestations, including glomerulonephritis, and that the envelope proteins, specifically the surface antigen, are involved in the formation of immune complexes that cause this condition.
**Correct Answer: C. The envelope proteins of HBV, specifically the surface antigen (HBsAg)**