Question: National Lampoon's Christmas Vacation is a film that stars an actor known for playing Dr. Leonard Hofstadter in what CBS sitcom?
Sentence (from "National Lampoon's Christmas Vacation"): The film stars Chevy Chase, Beverly D'Angelo and Randy Quaid, with Juliette Lewis and Johnny Galecki as the Griswold children Audrey and Rusty, respectively.
Relevant evidence: Yes