**Core Concept:** Gout is a common, chronic inflammatory arthritis caused by the deposition of monosodium urate crystals in joints, soft tissues, and kidneys. The formation of tophi is a hallmark feature of gout, and they consist of these crystal deposits.

**Why the Correct Answer is Right:** Tophi, or gouty deposits, are typically found in areas that are rich in synovial fluid, subcutaneous tissue, and/or connective tissue. Among the options provided, tophi formation is most likely to occur in the joints (option C) due to the presence of synovial fluid and connective tissue. The skin is rich in subcutaneous tissue, which is also a site for tophi formation (option D). The kidneys are involved in the pathogenesis of gout, but not directly related to tophi formation.

**Why Each Wrong Option is Incorrect:** Option A (vascular beds) is incorrect because tophi do not form within blood vessels. Option B (central nervous system) is incorrect because tophi are not found in the brain or spinal cord. The spleen is not a primary site for tophi formation, despite being involved in gout pathogenesis (option E).

**Clinical Pearl:** Tophi are primarily found in areas rich in synovial fluid, subcutaneous tissue, and/or connective tissue. This knowledge helps in diagnosing gout and ruling out other conditions that may present with similar symptoms.

**Correct Answer:** .