Which of the following medications is an example of a hypoglycemic agent?

Insulin is considered a hypoglycemic agent because it plays a crucial role in regulating blood sugar levels. It helps cells absorb glucose from the bloodstream, which is essential for managing conditions like diabetes. When administered, insulin effectively lowers blood sugar levels, thus helping to prevent hyperglycemia (high blood sugar), a common complication in diabetic patients.

The other medications listed do not serve this function. Aspirin is primarily an anti-inflammatory and analgesic; morphine is an opioid used for pain relief; and ibuprofen is a non-steroidal anti-inflammatory drug (NSAID) used to alleviate pain and inflammation. None of these medications have the specific action of lowering blood glucose levels, which is why they are not classified as hypoglycemic agents.