**Core Concept:** Gout is a common form of inflammatory arthritis caused by the deposition of monosodium urate crystals in the joints, leading to inflammation and pain. It is primarily due to elevated levels of uric acid in the blood. Uric acid is a product of purine nucleotide catabolism, which occurs in the liver, kidneys, and other tissues.

**Why the Correct Answer is Right:** Gout is characterized by a disorder of purine nucleotide catabolism, specifically the process of uric acid production and clearance. This leads to elevated serum uric acid levels and eventual deposition of monosodium urate crystals in the joints, causing inflammation and pain. The correct answer (C) focuses on the primary cause of gout, which is an imbalance in purine nucleotide catabolism.

**Why Each Wrong Option is Incorrect:**

A. While hyperuricemia is a risk factor for gout, it does not explain the disorder itself. Hyperuricemia is the state of having higher than normal levels of uric acid in the blood. However, it is not the disorder but a predisposing condition.

B. The misconception that gout is a disorder of calcium deposition is incorrect. Gout is specifically caused by uric acid and its crystal deposition, not calcium.

D. While crystal deposition can occur in other tissues like the kidneys, the primary disorder in gout is the joint involvement caused by uric acid crystals.

**Clinical Pearl:** Understanding the root cause of gout, which is a disorder of purine nucleotide catabolism and elevated uric acid levels, is crucial for diagnosing and treating the condition effectively. Adequate hydration, a balanced diet, and medications like allopurinol can help manage gout.