What is the primary purpose of adding lemon to tea?

The primary purpose of adding lemon to tea is to improve flavor. Lemon has a bright, citrusy taste that can complement the natural flavors of the tea, enhancing the overall drinking experience. The acidity from the lemon can balance out the bitterness of certain teas, making them more palatable.

While increasing acidity and enhancing color are valid aspects of adding lemon, they are secondary to the primary goal of flavor enhancement. Lemon does not significantly reduce caffeine content, so that choice does not align with the main intent of this practice. The addition of lemon is fundamentally about making the tea taste better, which is why improving flavor is the correct answer.