**Core Concept**
Colchicine is an anti-inflammatory medication used in the treatment of acute gout. The mechanism of action involves the inhibition of microtubule polymerization, which is essential for leukocyte migration and inflammatory cell activation.

**Why the Correct Answer is Right**
Colchicine binds to the beta subunit of tubulin, a key component of microtubules, thereby preventing the polymerization of microtubules. This action disrupts the migration of leukocytes, particularly neutrophils, to the site of inflammation. As a result, the inflammatory response is reduced, and the symptoms of acute gout are alleviated. The inhibition of microtubule polymerization also affects the activation of inflammatory cells, such as neutrophils, which are crucial in the pathogenesis of gout.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because colchicine does not primarily act by inhibiting the synthesis of inflammatory mediators, such as prostaglandins or leukotrienes. While these pathways are involved in the pathogenesis of inflammation, colchicine's mechanism of action is more closely related to its effects on microtubules.

**Option B:** This option is incorrect because colchicine does not primarily act by increasing the excretion of uric acid. Although colchicine has been shown to have some effects on uric acid metabolism, its primary mechanism of action in the treatment of acute gout is related to its effects on microtubules.

**Option C:** This option is incorrect because colchicine does not primarily act by inhibiting the activity of lysosomes. While lysosomal enzymes play a role in the pathogenesis of gout, colchicine's mechanism of action is more closely related to its effects on microtubules.

**Clinical Pearl / High-Yield Fact**
Colchicine is a classic example of a medication that is effective in the treatment of acute gout due to its ability to inhibit microtubule polymerization, thereby reducing leukocyte migration and inflammatory cell activation. However, it is essential to note that colchicine can have significant side effects, particularly at high doses, and should be used with caution.

**Correct Answer: B. Inhibition of microtubule polymerization.**