Radiation oncology is a form of cancer treatment that uses which to shrink of kill malignant neoplasms

• A. Low-energy non-ionizing radiation
• B. Surgical incisions
• C. High-energy ionizing radiation
• D. Chemotherapy drugs

Answer: (C)

Radiation oncology relies on high-energy ionizing radiation to shrink or kill malignant neoplasms. Ionizing radiation has enough energy to remove electrons from atoms, creating damage to DNA. Cancer cells are especially vulnerable because they divide rapidly and often have less robust DNA repair, so DNA damage from the radiation leads to cell death or permanent failure to replicate. High-energy forms include X-rays, gamma rays, and particle beams used in external beam or brachytherapy. Low-energy non-ionizing radiation doesn’t ionize DNA and isn’t used to treat cancer in this way. Surgical incisions are a physical removal method, not a radiation approach, and chemotherapy uses chemical agents rather than radiation.