**Core Concept**
Stereotactic radiosurgery (SRS) is a non-invasive, precise form of radiation therapy that delivers high doses of radiation to targeted areas within the body. It uses advanced imaging and computer technologies to localize and treat tumors or lesions with minimal damage to surrounding healthy tissues.

**Why the Correct Answer is Right**
SRS is typically used to treat small, well-defined lesions or tumors, such as those found in the brain, spine, or other areas. The high precision of SRS allows for the delivery of radiation doses that are significantly higher than those used in conventional radiation therapy, while minimizing the risk of damage to surrounding tissues.

**Why Each Wrong Option is Incorrect**
**Option A:** Gamma Knife is a type of SRS device, and thus is a correct application of SRS.
**Option B:** CyberKnife is another type of SRS device, and is also a correct application of SRS.
**Option C:** Tomotherapy is a type of intensity-modulated radiation therapy (IMRT), which is not a form of SRS but rather a different radiation therapy technique.

**Clinical Pearl / High-Yield Fact**
It's essential to understand the specific indications and limitations of SRS, as well as the different types of SRS devices available, to effectively integrate this treatment modality into clinical practice.

**Correct Answer: C. Tomotherapy**