Which of the following is an example of an anti-inflammatory drug?

Ibuprofen is classified as a nonsteroidal anti-inflammatory drug (NSAID), which means it is specifically designed to reduce inflammation and alleviate pain. It works by inhibiting enzymes involved in the production of prostaglandins, which are compounds in the body that mediate inflammation and pain. As a result, ibuprofen is commonly recommended for conditions that involve inflammation, such as arthritis, muscle pains, and headaches.

In contrast, the other choices do not serve the same purpose. Sertraline is an antidepressant in the selective serotonin reuptake inhibitor (SSRI) class, used primarily to treat depression and anxiety disorders. Codeine is an opioid analgesic that is mainly prescribed for pain relief but does not specifically target inflammation. Ambien, on the other hand, is a medication used to treat insomnia and does not have any anti-inflammatory properties. Therefore, among the options provided, ibuprofen is definitively the drug that exemplifies anti-inflammatory action.