**Core Concept**
Gout is a type of inflammatory arthritis characterized by the deposition of monosodium urate crystals in the joints, leading to acute and chronic inflammation. It is caused by an excess of uric acid in the body, which can be due to increased production or decreased excretion.

**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of gout, where the deposition of monosodium urate crystals triggers an inflammatory response. This response is mediated by the activation of immune cells, such as neutrophils, which release cytokines and other inflammatory mediators. The crystals are deposited in the joints due to the supersaturation of uric acid in the synovial fluid.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because it is not a characteristic of gout. Gout is not caused by a deficiency in pyridoxine (vitamin B6).
* **Option B:** This is incorrect because it is not a characteristic of gout. Hypercalcemia is associated with conditions such as hyperparathyroidism, not gout.
* **Option C:** This is incorrect because it is not a characteristic of gout. The deposition of calcium pyrophosphate dihydrate (CPPD) crystals is characteristic of pseudogout, not gout.

**Clinical Pearl / High-Yield Fact**
Gout is often referred to as "the disease of kings" due to its historical association with excessive consumption of rich foods and drinks.

**Correct Answer: C. The deposition of calcium pyrophosphate dihydrate (CPPD) crystals is characteristic of pseudogout, not gout.**