Question: The 1989–90 NBA season was the Bulls' 24th season in the National Basketball Association, despite their solid playoff run last year, the Bulls fired head coach Doug Collins and replaced him with who, a former American professional basketball player, coach and executive in the National Basketball Association (NBA)?
Sentence (from "1989–90 Chicago Bulls season"): Under Jackson, the Bulls finished the regular season with a 55–27 record, averaging 109.5 points per game and being led by Michael Jordan's league-leading 33.6 ppg.
Relevant evidence: No