Final answer:
Acute kidney injury (AKI) is a condition characterized by a rapid decline in kidney function, which can be potentially reversible with appropriate treatment. It is not limited to older individuals and can affect people of all ages.
Correct option is 5.
Step-by-step explanation:
Acute kidney injury (AKI) is a condition characterized by a rapid decline in kidney function. It can be caused by various factors such as infections, surgeries, and medications. The disease course of AKI is potentially reversible, meaning that with prompt and appropriate treatment, kidney function may improve. However, if left untreated, AKI can lead to serious complications and even death. It is important to note that while AKI can affect people of all ages, it is not limited to older individuals.