Task: Question Answering
Input (English): Passage: Hockey helmet -- The American Hockey League, the top minor league in North America required all players to wear a visor prior to the start of the 2006--07 season. The NHL ``strongly recommends'' the use of visors. In 2013, the NHL began requiring all players with less than 25 games of experience to wear visors.
Question: is it mandatory to wear a visor in the nhl
Output (English): 1