Final answer:
Oxygen-15 undergoes positron emission and produces the element nitrogen-15.
Step-by-step explanation:
Positron emission is the emission of a positron from the nucleus. Oxygen-15 is an example of a nuclide that undergoes positron emission. When oxygen-15 (15O) undergoes positron emission, it turns into nitrogen-15 (15N). Therefore, the element produced through the process of positron emission from oxygen-15 is nitrogen.