**Core Concept**
Fecal pollution refers to the presence of pathogens or indicators of fecal contamination in water or other environmental samples. It is often monitored using bacterial indicators like Escherichia coli (E. coli) or other fecal coliforms. The correct answer will be a substance not typically associated with fecal pollution.

**Why the Correct Answer is Right**
The correct answer is likely to be a substance that does not originate from fecal matter. Fecal pollution is primarily associated with human or animal waste. A substance not seen in fecal pollution would be one that is naturally occurring or has a different source.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option might be a substance commonly found in fecal matter, making it incorrect.

**Option B:**
This option could be a substance associated with fecal pollution, making it incorrect.

**Option C:**
This option might be a substance that is not typically found in fecal matter, but could still be associated with fecal pollution due to other factors.

**Option D:**
This option could be a substance that is not associated with fecal pollution, making it a strong candidate for the correct answer.

**Clinical Pearl / High-Yield Fact**
Fecal coliforms, including E. coli, are commonly used indicators of fecal pollution due to their presence in the human gut and ability to survive in various environmental conditions.

**Correct Answer: D. A substance not typically associated with fecal pollution is a non-bacterial, non-fecal contaminant, such as a plant or mineral particle.**