Which imaging technique uses X-rays to generate a three-dimensional image of internal organs?

CT scan.

The correct answer is (2) CT scan.

Explanation:

(1) Radiography: Radiography, also known as X-ray imaging, uses X-rays to create two-dimensional images of the internal structures of the body. It provides a flat, black-and-white image that helps visualize bones and certain tissues but does not generate a three-dimensional image.

(2) CT scan: CT (Computed Tomography) scan, also known as CAT scan, combines a series of X-ray images taken from different angles to create cross-sectional images of the body. These images are then used to generate a three-dimensional representation of the internal organs, bones, and tissues. CT scan provides detailed information about the size, shape, and density of structures within the body.

(3) MRI: MRI (Magnetic Resonance Imaging) uses strong magnetic fields and radio waves to generate detailed images of the body's internal structures. It is particularly useful for imaging soft tissues, such as the brain, muscles, and organs. However, MRI does not use X-rays and does not specifically generate three-dimensional images.

(4) Biopsy: Biopsy is a procedure to collect a sample of tissue or cells from a specific area of the body for further examination under a microscope. It is not an imaging technique and does not generate images.

In summary, the imaging technique that uses X-rays to generate a three-dimensional image of internal organs is a CT scan.