Question: Troy McClure is a fictional character from the American animated sitcom "The Simpsons" who appeared as the main character in an episode that aired when?
Sentence (from "Patty and Selma"): Patty and Selma first appeared on the first ever aired Simpsons episode "Simpsons Roasting On An Open Fire", which aired on December 17, 1989.
Relevant evidence: No