Which type of condition is defined as a disease that develops and continues over a long period?

The correct answer is - a chronic disease

Explanation:

A chronic disease is a disease that develops and persists over a long time period. Some of the examples of chronic disease are cancer, diabetes, arthritis, asthma, Cystic fibrosis, etc. Cancer, diabetes, and heart disease are those chronic diseases that are the leading causes of death in the United States.

Many chronic diseases can be caused by our unhealthy lifestyle and risk behaviors like poor nutrition, tobacco use which can cause mouth and lung cancer, lack of physical activity which can cause heart disease and diabetes. So the chronic disease is the correct answer.