**Core Concept**
Arthritis mutilans is a rare and severe form of psoriatic arthritis characterized by extensive joint destruction, leading to a "mutilating" deformity of the hands and feet. This condition is often associated with psoriasis, an autoimmune skin disease.

**Why the Correct Answer is Right**
Arthritis mutilans is a complication of psoriatic arthritis, which involves the abnormal activation of T cells and the production of pro-inflammatory cytokines, such as TNF-alpha, leading to joint inflammation and destruction. The condition is often resistant to conventional treatments, including non-steroidal anti-inflammatory drugs and disease-modifying antirheumatic drugs (DMARDs).

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because arthritis mutilans is not typically associated with rheumatoid arthritis, which has a different underlying pathophysiology and clinical presentation.
**Option B:** This option is incorrect because osteoarthritis is a degenerative joint disease that does not typically involve autoimmune mechanisms or severe joint destruction.
**Option C:** This option is incorrect because ankylosing spondylitis is a type of spondyloarthritis that primarily affects the spine and large joints, rather than the hands and feet.

**Clinical Pearl / High-Yield Fact**
Arthritis mutilans is a rare but devastating complication of psoriatic arthritis, highlighting the importance of early recognition and aggressive treatment of this condition.

**Correct Answer:** D. Psoriatic arthritis