**Core Concept**
Epidemic dropsy is a condition characterized by peripheral edema, often occurring in epidemic proportions, typically due to the consumption of mustard oil contaminated with toxic compounds.

**Why the Correct Answer is Right**
The correct answer is related to the toxic compound sanguinarine, which is found in the seeds of Argemone mexicana. Sanguinarine is absorbed into the bloodstream and causes endothelial damage, leading to vasodilation and increased vascular permeability. This results in the characteristic peripheral edema and other clinical features of epidemic dropsy.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be tempting, but it is not directly related to epidemic dropsy.
**Option B:** This is not the correct answer, as it does not accurately describe the pathogenesis of epidemic dropsy.
**Option C:** This option might seem plausible, but it is not the correct cause of epidemic dropsy.

**Clinical Pearl / High-Yield Fact**
Epidemic dropsy is a preventable condition that highlights the importance of ensuring the quality of edible oils and the need for public health measures to prevent contamination.

**Correct Answer: D. Sanguinarine from Argemone mexicana seeds.**