Which of the following is a feature of psoriatic arthritis?

• A. Nail changes
• B. Fever
• C. Morning stiffness
• D. Hypertension

Answer: (A)

Psoriatic arthritis often brings nail involvement alongside joint symptoms. Nail changes such as pitting, ridging, onycholysis (lifting of the nail from the nail bed), and hyperkeratosis are common and can be a helpful clue that arthritis is associated with psoriasis. This nail involvement is more characteristic of psoriatic arthritis than the other options listed.

Inflammatory morning stiffness can occur with psoriatic arthritis, but it’s not unique to it and can be seen in other inflammatory arthritides. Fever is not a typical feature of psoriatic arthritis itself, and hypertension is not part of the rheumatic features—though it may exist as a comorbidity in patients with chronic illness.

So, the presence of nail changes best identifies psoriatic arthritis among the options.