**Core Concept**
Visceral larva migrans (VLM) is a parasitic infection caused by the larvae of nematodes, particularly *Toxocara* species, which are usually found in contaminated soil or feces of infected animals. This infection occurs when the larvae penetrate the intestinal wall and migrate through various organs, causing tissue damage and inflammation.

**Why the Correct Answer is Right**
The child's habit of eating dirt, also known as pica, increases the risk of ingesting *Toxocara* ova, which can then hatch into larvae in the child's intestines. The larvae then penetrate the intestinal wall and migrate through the body, causing VLM. This is a classic example of a zoonotic infection, where an animal parasite is transmitted to a human host.

**Why Each Wrong Option is Incorrect**
**Option A:** *Ancylostoma duodenale* is a type of hookworm that can cause intestinal infection, but it is not the primary cause of VLM.
**Option B:** *Ascaris lumbricoides* is a type of roundworm that can cause intestinal infection, but it is not typically associated with VLM.
**Option C:** *Strongyloides stercoralis* is a type of nematode that can cause intestinal infection and autoinfection, but it is not the primary cause of VLM.

**Clinical Pearl / High-Yield Fact**
Pica is a common habit in children, and it can increase the risk of parasitic infections, including VLM. Parents and caregivers should be aware of this habit and take steps to prevent exposure to contaminated soil or feces.

**Correct Answer:** D. *Toxocara*