Which of these medications is least likely to cause tinnitus?

The correct answer is Fluoxetine. Among the options provided, Fluoxetine is the medication least likely to cause tinnitus. Gentamicin, Lasix, and Aspirin are known ototoxic medications that have a potential side effect of causing tinnitus, a ringing in the ear. Gentamicin is an antibiotic, Lasix is a diuretic, and Aspirin is a common pain reliever that can lead to tinnitus. In contrast, Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) primarily used as an antidepressant, and it has a lower risk of causing tinnitus compared to the other options.