Final answer:
Option 4: Chronic Medical Conditions. About 55 percent of all organic mental disorders in the older population are caused by chronic medical conditions.
Step-by-step explanation:
The correct answer is Option 4: Chronic Medical Conditions.
About 55 percent of all organic mental disorders in the older population are caused by chronic medical conditions. Chronic medical conditions refer to long-term illnesses or diseases that persist over time, such as heart disease, diabetes, arthritis, and respiratory disorders.
These conditions can affect the brain and contribute to mental disorders in older adults. For example, chronic medical conditions can lead to decreased blood flow or oxygen supply to the brain, which can result in cognitive impairment or dementia.