**Core Concept**
Kenny Packs, also known as wet packs or hot packs, are a type of thermal therapy used to induce vasodilation and reduce muscle spasm. This treatment involves applying a hot or wet pack to the affected area to increase blood flow and relieve pain.

**Why the Correct Answer is Right**
Kenny Packs were specifically used in the treatment of rheumatic fever, a systemic inflammatory disease that can cause joint pain and inflammation. The application of Kenny Packs helps to reduce pain and inflammation by inducing vasodilation, which increases blood flow to the affected area. This, in turn, promotes the removal of inflammatory mediators and reduces muscle spasm.

**Why Each Wrong Option is Incorrect**
* **Option A:** Kenny Packs were not used for treating tuberculosis. While heat therapy may be used to relieve symptoms, Kenny Packs are specifically associated with rheumatic fever treatment.
* **Option B:** Kenny Packs are not a form of radiation therapy. They involve the application of heat to induce vasodilation, not ionizing radiation to kill cancer cells.
* **Option C:** Kenny Packs were not used for treating meningitis. While heat therapy may be used to relieve symptoms, Kenny Packs are specifically associated with rheumatic fever treatment.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Kenny Packs should be used with caution, as they can cause burns or skin irritation if applied for too long or at too high a temperature. The ideal temperature for Kenny Packs is between 98°F and 104°F (36.7°C and 40°C).

**Correct Answer:** C.