What has a doctor done when he or she has determined the nature of a disease?

• A. Diagnosed it
• B. Treated it
• C. Monitored it
• D. Prevented it

Answer: (A)

Diagnosing is the act of identifying what disease is causing the symptoms. When a doctor has determined the nature of a disease, they have diagnosed it—that labeled the condition so they know what they’re dealing with. This identification guides what treatment to use and what monitoring or preventive steps might follow. The other options describe what happens after diagnosis: treatment is giving therapy, monitoring is watching progress over time, and prevention is reducing future risk. However, none of those describe the act of naming or identifying the disease itself.