**Core Concept**
The question is testing the knowledge of opportunistic infections in immunocompromised patients, specifically those with Acquired Immunodeficiency Syndrome (AIDS). The correct answer requires understanding the helminthic infections that can take advantage of a weakened immune system.

**Why the Correct Answer is Right**
The most common helminthic infection in AIDS patients is Strongyloides stercoralis. This parasite can cause a range of symptoms, from mild gastrointestinal issues to life-threatening hyperinfection syndrome, particularly in immunocompromised individuals. Strongyloides stercoralis infection occurs through skin contact with contaminated soil, and the larvae can autoinfect the host, leading to a persistent and potentially severe infection.

**Why Each Wrong Option is Incorrect**
**Option A:** Hookworm infection is common in developing countries but is not the most common helminthic infection in AIDS patients.
**Option B:** Toxocara species are primarily associated with zoonotic infections and are not the most common helminthic infection in AIDS patients.
**Option C:** There is no widely recognized helminthic infection by this name that is commonly associated with AIDS.

**Clinical Pearl / High-Yield Fact**
In immunocompromised patients, Strongyloides stercoralis infection can lead to a hyperinfection syndrome, which is a medical emergency requiring prompt treatment.

**Correct Answer: C. Strongyloides stercoralis**