**Core Concept**
Henoch Schonlein purpura (HSP) is a form of vasculitis that affects small blood vessels, characterized by the deposition of immune complexes containing IgA antibodies. It typically presents with palpable purpura, abdominal pain, arthritis, and renal involvement.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of HSP, where the deposition of immune complexes containing IgA antibodies leads to inflammation and damage to small blood vessels. This results in the characteristic symptoms of HSP, including palpable purpura, abdominal pain, and renal involvement. The IgA antibody is a key component of the immune complex and plays a crucial role in the development of HSP.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is not a characteristic feature of HSP. While some patients with HSP may have systemic symptoms like fever, it is not a defining feature of the condition.

**Option B:**
This option is incorrect because HSP is typically associated with IgA antibodies, not IgG. The deposition of IgA immune complexes is a hallmark of HSP.

**Option C:**
This option is not a specific feature of HSP. While some patients with HSP may have joint involvement, it is not a defining characteristic of the condition.

**Option D:**
This option is incorrect because HSP is not typically associated with eosinophilia. While some patients with HSP may have an elevated eosinophil count, it is not a characteristic feature of the condition.

**Clinical Pearl / High-Yield Fact**
A classic clinical correlation for HSP is the presence of abdominal pain and gastrointestinal bleeding, which can be associated with the deposition of IgA immune complexes in the gastrointestinal tract.

**Correct Answer: B. IgA antibodies.**