**Core Concept**
Non-deforming arthritis refers to a type of arthritis that does not lead to deformity or destruction of the joint. This category includes various conditions that cause joint inflammation and pain but do not result in permanent damage or deformity.

**Why the Correct Answer is Right**
The correct answer is likely Osteoarthritis (OA), a degenerative joint disease characterized by progressive wear and tear of the joint cartilage and underlying bone. OA is the most common type of non-deforming arthritis, and its symptoms include joint pain, stiffness, and limited mobility. The condition is often associated with age-related cartilage degeneration, obesity, and repetitive joint stress.

**Why Each Wrong Option is Incorrect**
**Option A:** Rheumatoid Arthritis (RA) is a type of deforming arthritis that causes inflammation and destruction of the joint, leading to deformity and disability. RA is characterized by autoimmune responses against joint tissues, resulting in joint pain, swelling, and deformity.

**Option B:** Gout is a type of inflammatory arthritis that can cause acute joint pain and swelling, but it is not typically considered a non-deforming arthritis. Gout is caused by the deposition of urate crystals in the joint, leading to inflammation and pain.

**Option C:** Psoriatic Arthritis (PsA) is a type of deforming arthritis that occurs in people with psoriasis, an autoimmune skin condition. PsA causes inflammation and joint damage, leading to deformity and disability.

**Clinical Pearl / High-Yield Fact**
It's essential to note that while OA is a non-deforming arthritis, it can still cause significant joint pain and disability, especially in older adults. Early diagnosis and management are crucial to prevent further joint damage and improve quality of life.

**Correct Answer:** D. Osteoarthritis