**Core Concept**
The differentiation between obstruction and paralytic cataract hinges on the mechanism of lens opacification and the underlying cause. Obstruction cataracts occur due to the accumulation of metabolites or proteins within the lens, whereas paralytic cataracts result from the disruption of lens metabolism and function.

**Why the Correct Answer is Right**
Obstruction cataracts can be differentiated from paralytic cataracts by the presence of a characteristic "snowflake" or "floral" pattern on slit-lamp examination. This pattern is due to the accumulation of proteinaceous material within the lens fibers. In contrast, paralytic cataracts exhibit a more diffuse or ground-glass appearance. The correct answer involves identifying the specific clinical feature that distinguishes obstruction from paralytic cataract.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option may be tempting, but it does not accurately describe the characteristic pattern seen in obstruction cataracts.
* **Option B:** This option is incorrect because it does not specifically address the differentiation between obstruction and paralytic cataract.
* **Option D:** This option is incorrect because it is too vague and does not provide a clear clinical feature for differentiation.

**Clinical Pearl / High-Yield Fact**
When differentiating between obstruction and paralytic cataract, remember the mnemonic "S-O-P" to recall the characteristic features: Snowflake (obstruction) vs. Opacity (paralytic).

**Correct Answer: C.**