**Core Concept**
Computed Tomography (CT) is a medical imaging technique that uses computer-processed combinations of multiple X-ray measurements taken from different angles to produce cross-sectional images of the body. This technology allows for high-resolution, detailed images of internal organs, bones, and soft tissues.

**Why the Correct Answer is Right**
The correct answer is based on the fundamental principle of CT scans, which involves the use of X-rays to generate images. The X-rays are absorbed by different tissues at varying rates, allowing for the creation of detailed images. The CT scanner rotates around the patient, taking multiple X-ray measurements at different angles, which are then reconstructed into a comprehensive image.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it contradicts the fundamental principle of CT scans. CT scans do indeed use X-rays to generate images.
**Option B:** This option is incorrect because it is a true statement about CT scans. CT scans can be used to detect a wide range of conditions, including cancers, injuries, and vascular diseases.
**Option C:** This option is incorrect because it is a true statement about CT scans. CT scans can be used to guide biopsies and other interventional procedures.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that CT scans involve ionizing radiation, which can have adverse effects on the body. Therefore, CT scans should be used judiciously and only when necessary.

**Correct Answer: B. CT scans are not used to diagnose infections.**