**Core Concept**
Brachytherapy delivers radiation directly to the tumor from implanted radioactive sources, minimizing exposure to surrounding healthy tissues. The key advantage lies in its ability to concentrate radiation dose at the tumor site while reducing overall radiation burden to normal tissues.

**Why the Correct Answer is Right**
Option **b** is correct because brachytherapy significantly reduces radiation exposure to normal tissues due to the localized delivery of radiation. Option **c** is correct because the radioactive source is placed directly within or near the tumor, allowing for a high radiation dose to the diseased tissue while sparing adjacent areas. This precise targeting maximizes therapeutic effect and minimizes side effects.

**Why Each Wrong Option is Incorrect**
Option **a**: Brachytherapy is invasive as it requires surgical placement of radioactive sources into the body.
Option **d**: It is not suitable for all malignancies—only certain localized tumors (e.g., prostate, cervical, breast) benefit due to anatomical and clinical constraints.
Option **e**: It requires highly trained personnel for safe implantation, dosimetry, and post-procedure management.

**Clinical Pearl / High-Yield Fact**
Brachytherapy is especially effective in localized cancers where precision is critical—such as cervical or prostate cancer—and is often used in combination with external beam radiation for optimal outcomes.

✓ Correct Answer: D. bc