A
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Visible light passes through glass. Other types of electromagnetic radiation are able to pass through other materials in a similar way. Which of the following are used in medical technology because they can pass through some parts of the human body?

### Choices:
A. x-rays
B. infrared waves
C. microwaves
D. ultraviolet rays

### Answer:
