context: London's most popular sport is football and it has fourteen League football clubs, including five in the Premier League: Arsenal, Chelsea, Crystal Palace, Tottenham Hotspur, and West Ham United. Among other professional teams based in London include Fulham, Queens Park Rangers, Millwall and Charlton Athletic. In May 2012, Chelsea became the first London club to win the UEFA Champions League. Aside from Arsenal, Chelsea and Tottenham, none of the other London clubs have ever won the national league title.
question: ఎన్ని ప్రొఫెషనల్ ఫుట్బాల్ క్లబ్బులు లండన్ను తమ ఇల్లు అని పిలుస్తాయి?
answers: fourteen