Question: Steve Kettmann was a mentor to the minority owner of which MLB team?
Sentence (from "Steve Kettmann"): The book explores Alderson's role as general manager of the Oakland A's in the 1980s and 1990s, including his role as a mentor to the young Billy Beane, who was later made famous in the movie adaption of the Michael Lewis book "Moneyball".
Relevant evidence: Yes