Question: Sunderland Association Football Club is an English professional football club that plays in a championship referred to as the Sky Bet Championship for what reasons?
Sentence (from "2017–18 EFL Championship"): The 2017–18 EFL Championship (referred to as the Sky Bet Championship for sponsorship reasons) is the second season of the EFL Championship under its current name, and the twenty-sixth season under its current league structure.
Relevant evidence: Yes