**Core Concept**
Cysticercosis is a parasitic disease caused by the larval stage of the pork tapeworm (Taenia solium). The infection occurs when the larvae are ingested through contaminated food or water, or through autoinfection in cases of tapeworm infestation. The larvae then migrate to various tissues in the body, leading to tissue damage and inflammation.

**Why the Correct Answer is Right**
The most common affected tissue in cysticercosis is the muscle tissue. This is because the larvae of Taenia solium tend to migrate to the muscles, where they form cysts and cause inflammation. The muscles, particularly the skeletal muscles, provide a favorable environment for the larvae to develop and cause damage. The presence of cysts in the muscles can lead to symptoms such as muscle pain, swelling, and weakness.

**Why Each Wrong Option is Incorrect**
**Option A:** The brain is a less common site for cysticercosis, and when it occurs, it is known as neurocysticercosis. This can lead to more severe symptoms, including seizures, headaches, and neurological deficits.

**Option B:** The eye is an extremely rare site for cysticercosis, and when it occurs, it can lead to severe visual impairment and blindness.

**Option D:** The liver is not typically affected by cysticercosis, and when it is, it is usually due to the spread of the infection from another site, such as the muscles.

**Clinical Pearl / High-Yield Fact**
It is essential to note that cysticercosis can be diagnosed through imaging studies, such as CT or MRI scans, which can reveal the presence of cysts in the muscles or other tissues.

**Correct Answer:**
✓ Correct Answer: C. Muscles