Answer the following question given this paragraph: 

During late adulthood, people are not as physically able. For example, they usually have less muscle and slower reflexes. Their immune system also doesn’t work as well as it used to. As a result, they have a harder time fighting diseases like the flu. The risk of developing diseases such as heart disease and cancer continues to rise. Arthritis is also common. In arthritis, joints wear out and become stiff and painful. As many as one in four late adults may develop Alzheimer’s disease. In this disease, brain changes cause mental abilities to decrease.


Q: What is it called when your joints start to wear out and they become stiff and painful?

 Choices:

- adenitis

- endometriosis

- tendonitis

- arthritis

A:
arthritis
