**Core Concept**
The question is testing the differential diagnosis of intestinal parasites, specifically the identification of eggs in stool samples. The correct answer is related to the size and morphology of the eggs, which is a crucial factor in distinguishing between different types of parasitic infections.

**Why the Correct Answer is Right**
The correct answer is likely related to the fact that eggs of *Toxocara* species, which are common parasites in children, are typically smaller than the size mentioned (100µm). The eggs of *Toxocara* species are usually around 80-90µm in size. The presence of eggs of this size in a stool sample would suggest an infection with *Toxocara*, which is a common cause of visceral larva migrans in children.

*Toxocara* species are typically acquired through the fecal-oral route, and the eggs are ingested by humans through contaminated food or water. The larvae then migrate through the body, causing a range of symptoms including abdominal cramps, loose stool, and respiratory symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is also not provided.
**Option C:** This option is not provided.
**Option D:** This option is also not provided.

**Clinical Pearl / High-Yield Fact**
When diagnosing intestinal parasites, it's essential to consider the size and morphology of the eggs, as well as the clinical presentation of the patient. In children, *Toxocara* species are a common cause of parasitic infections, and the presence of eggs in stool samples can be an important diagnostic clue.

**Correct Answer:** D.