Getting rid of carbon dioxide is known as:

A) expiration.
B) inspiration.
C) aspiration.
D) respiration.

Expiration is the process of getting rid of carbon dioxide from the body during respiration. Inspiration is the process of taking in oxygen while aspiration refers to the act of inhaling foreign materials or fluids into the lungs. Therefore, only option A (expiration) is the correct choice for getting rid of carbon dioxide.