Question: Best known for his World Wrestling Entertainment appearances, Charlie Haas and what other major wrestler formed the World's Greatest Tag Team?
Sentence (from "WWE Tag Team Championship"): Originally established by the then-World Wide Wrestling Federation (WWWF) on June 3, 1971 (renamed World Wrestling Federation in 1979), it served as the only title for tag teams in the promotion until the then-World Wrestling Federation (WWF) bought World Championship Wrestling (WCW) in March 2001, which added their tag team championship.
Relevant evidence: No