**Core Concept**
Hydatid disease of the liver is a parasitic infection caused by the larval stage of a specific tapeworm species. This infection is characterized by the formation of cysts in the liver, which can cause various symptoms and potentially lead to serious complications.

**Why the Correct Answer is Right**
The correct answer, **Echinococcus granulosus**, is a type of tapeworm that belongs to the family Taeniidae. The larval stage of this tapeworm is responsible for hydatid disease. When the tapeworm eggs are ingested, the larvae hatch and migrate to the liver, where they form cysts. The liver cysts can grow and cause symptoms such as abdominal pain, fever, and weight loss. The Echinococcus granulosus tapeworm is commonly found in dogs and other canines, and humans become infected through contact with contaminated feces or undercooked meat.

**Why Each Wrong Option is Incorrect**
* **Option A:** Strongyloides is a type of nematode worm that causes strongyloidiasis, a different parasitic infection that affects the lungs and intestines. It is not associated with hydatid disease of the liver.
* **Option C:** Taenia solium is a type of tapeworm that causes taeniasis, a parasitic infection that affects the intestines. While it is a type of tapeworm, it is not the cause of hydatid disease of the liver.
* **Option D:** Trichinella spiralis is a type of nematode worm that causes trichinosis, a parasitic infection that affects the muscles. It is not associated with hydatid disease of the liver.

**Clinical Pearl / High-Yield Fact**
It is essential to note that hydatid disease of the liver can be diagnosed using imaging studies such as ultrasound and CT scans, which can help identify the cysts and guide treatment. Surgical removal of the cysts is often necessary to treat the infection.

**✓ Correct Answer: B. Echinococcus granulosus**