**Core Concept**
Mammography is a type of low-dose X-ray imaging used for the early detection and diagnosis of breast cancer. It involves the use of a specialized X-ray machine to produce detailed images of the breast tissue.

**Why the Correct Answer is Right**
The correct answer involves the principle of X-ray attenuation, where the X-ray beam interacts with the dense breast tissue, resulting in the production of an image. Mammography uses a combination of X-ray energies to optimize the contrast between different types of breast tissue, allowing for the detection of subtle abnormalities such as tumors. The use of a specialized X-ray machine and a high-resolution digital detector enables the production of high-quality images that can be used for diagnostic purposes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because mammography does not use ultrasound technology to produce images. While ultrasound is a valuable tool in breast imaging, it is not the primary modality used in mammography.

**Option B:** This option is incorrect because mammography does not use magnetic resonance imaging (MRI) technology. MRI is a different type of imaging modality that uses a strong magnetic field and radio waves to produce detailed images of the breast tissue.

**Option C:** This option is incorrect because mammography does not use computed tomography (CT) scans. CT scans are typically used for imaging the internal structures of the body, such as the lungs or liver, and are not typically used for breast imaging.

**Clinical Pearl / High-Yield Fact**
A key aspect of mammography is the use of a standardized technique, including the compression of the breast tissue to ensure that the X-ray beam interacts with the tissue in a consistent manner. This helps to optimize the quality of the images produced and reduces the risk of false positives or false negatives.

**Correct Answer: A. X-rays.**