Final answer:
Steroids have widespread effects on the body and are the correct answer to which medication does not treat a single specific symptom.
Step-by-step explanation:
The medication that has widespread effects instead of treating a single specific symptom is D. Steroid. Steroids have anti-inflammatory properties and can suppress the immune response, making them a common treatment for various conditions including type III hypersensitivity reactions. In contrast, antibiotics are specific to bacterial infections and would not be helpful in viral infections like the common cold. Analgesics are pain relievers and do not have widespread effects on the body's functioning. Antiviral drugs tend to be specific to certain viruses and do not affect the body as broadly as steroids.