**Core Concept**
Dressler's Syndrome, also known as post-myocardial infarction syndrome, is an autoimmune inflammatory condition that occurs after a myocardial infarction (MI). It involves the formation of autoantibodies against the heart muscle, leading to inflammation and subsequent damage.

**Why the Correct Answer is Right**
The exact mechanism of Dressler's Syndrome is not fully understood, but it is believed to occur due to the release of antigens from the damaged heart muscle, which triggers an autoimmune response. This response causes the production of autoantibodies that target the heart muscle, leading to inflammation and clinical symptoms. The condition is characterized by the presence of pericarditis, myocarditis, and sometimes pleuritis.

**Why Each Wrong Option is Incorrect**
**Option A:** Dressler's Syndrome is typically seen within 2-3 weeks after MI. This is incorrect as the typical time frame for Dressler's Syndrome is 2-9 weeks after MI.
**Option B:** Dressler's Syndrome is caused by a viral infection. This is incorrect as the exact cause of Dressler's Syndrome is not known, but it is believed to be an autoimmune response to the heart muscle.
**Option C:** Dressler's Syndrome is treated with corticosteroids. While corticosteroids may be used to treat the inflammation associated with Dressler's Syndrome, this is not a definitive treatment and the condition may require other interventions.

**Clinical Pearl / High-Yield Fact**
Dressler's Syndrome should be considered in any patient who presents with pericarditis or myocarditis within 2-9 weeks of MI, as it requires specific treatment and monitoring.

**Correct Answer: B. Dressler's Syndrome is an autoimmune inflammatory condition that occurs after a myocardial infarction.**