Final answer:
The eligibility of Ontario residents under the Trillium Drug Program is assessed based on their income level and age.
Step-by-step explanation:
The eligibility of Ontario residents under the Trillium Drug Program is assessed based on their income level and age. Ontario residents must have a valid Ontario Health Insurance Plan (OHIP) card and meet the income requirements in order to qualify for the program. Age is also a factor, as the program provides coverage for individuals who are not eligible for the Ontario Drug Benefit program.