**Core Concept**
Itch, also known as pruritus, is a complex sensation that involves multiple neural pathways and can be associated with several underlying medical conditions. The concept of "itch as a disease" suggests that certain conditions can manifest primarily with symptoms of itch without other obvious skin or systemic abnormalities.

**Why the Correct Answer is Right**
The correct answer is associated with Cholestasis. Cholestasis is a condition characterized by a reduction or stoppage of bile flow, which can lead to an accumulation of bile salts in the blood. The accumulation of bile salts activates specific receptors on nerve endings, leading to the sensation of itch. This is known as the "bile salt itch" pathway. The itch associated with cholestasis can be intense and is often a prominent symptom of the condition.

**Why Each Wrong Option is Incorrect**
**Option A:** Atopic Dermatitis is a chronic skin condition characterized by dry, itchy skin, but it is not the primary condition referred to by the statement "itch is disease".

**Option B:** Uremia is a condition associated with renal failure and can cause pruritus, but it is not the best example of "itch as a disease".

**Option C:** Pruritus is a common symptom of various conditions, but this option is too broad and does not specifically relate to "itch as a disease".

**Clinical Pearl / High-Yield Fact**
The "itch-scratch cycle" is a common phenomenon in patients with chronic itch, where the act of scratching can temporarily relieve the itch but ultimately exacerbate the underlying condition.

**Correct Answer:** C. Cholestasis.