Question:  Mary Tyler Moore: The 20th Anniversary Show commemorated the 20th anniversary of a sitcom created by what two people?
Sentence (from "Mary Tyler Moore: The 20th Anniversary Show"): Mary Tyler Moore: The 20th Anniversary Show is a 1991 American television special commemorating the 20th anniversary of the 1970–77 sitcom "The Mary Tyler Moore Show" which was broadcast on CBS on February 18, 1991.
Relevant evidence: Yes