**Core Concept**
Fluorosis is a condition resulting from excessive fluoride intake, which can lead to dental and skeletal abnormalities. The World Health Organization (WHO) recommends a maximum fluoride concentration of 1.5 mg/L in drinking water to prevent dental fluorosis.

**Why the Correct Answer is Right**
Fluorosis can occur in individuals whose staple diet is high in fluoride, even if the drinking water fluoride content is within the recommended limits. This is because the total fluoride intake from food, water, and other sources can add up to exceed the safe threshold. Foods that are particularly high in fluoride include tea, seaweed, and some types of fish, such as cod and snapper. In areas where these foods are staples, the risk of fluorosis increases, even if the local water supply is not excessively fluoridated.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the specific foods mentioned in the question are not typically associated with high fluoride content.
* **Option B:** This option is incorrect because it is not a well-documented risk factor for fluorosis.
* **Option C:** This option is incorrect because while it is a true statement, it is not the correct answer to the question.

**Clinical Pearl / High-Yield Fact**
In areas where fluorosis is prevalent, it's essential to consider the total fluoride intake from all sources, including food and water, to prevent excessive fluoride consumption.

**Correct Answer:** D. Tea