**Core Concept**
Rheumatoid arthritis (RA) is a chronic autoimmune disorder characterized by inflammation of the synovial joints, leading to cartilage and bone destruction. The human leukocyte antigen (HLA) complex plays a crucial role in the immune system, and specific HLA alleles have been associated with an increased risk of developing RA.

**Why the Correct Answer is Right**
The correct answer is associated with RA due to its role in presenting self-antigens to T-cells, leading to an autoimmune response. **HLA-DRB1** is a key allele that presents citrullinated peptides to CD4+ T-cells, triggering an immune response against the synovium. This results in the activation of various immune cells, including macrophages and T-cells, which contribute to joint inflammation and destruction.

**Why Each Wrong Option is Incorrect**
**Option A:** HLA-A is involved in presenting peptides to CD8+ T-cells, which is not directly associated with RA.
**Option B:** HLA-C is also involved in antigen presentation, but its association with RA is less clear.
**Option C:** HLA-E is involved in presenting peptides to natural killer cells and some T-cells, but it is not directly associated with RA.

**Clinical Pearl / High-Yield Fact**
The HLA-DRB1 allele is a strong predictor of RA, particularly the shared epitope (SE) alleles, which are associated with a higher risk of developing severe RA.

**Correct Answer: D. HLA-DRB1**