Does the sentence "Chengdu Economic and Technological Development Zone (Chinese: ; pinyin: Chengdu jingji jishu kaifa qu) was approved as state-level development zone in February 2000." provide a valid answer to the question "When was the Chengdu Economic and Technological Development Zone approved?"

A: yes

Does the sentence "Following World War II, Milton Friedman created the concept of monetarism." provide a valid answer to the question "What did John Maynard Keynes want to separate?"

A: no

Does the sentence "The FBI has maintained files on numerous people, including celebrities such as Elvis Presley, Frank Sinatra, John Denver, John Lennon, Jane Fonda, Groucho Marx, Charlie Chaplin, the band MC5, Lou Costello, Sonny Bono, Bob Dylan, Michael Jackson, and Mickey Mantle." provide a valid answer to the question "Did the FBI keep files on Elvis Presley?"

A: yes

Does the sentence "A retrospective of Cezanne's paintings had been held at the Salon d'Automne of 1904, current works were displayed at the 1905 and 1906 Salon d'Automne, followed by two commemorative retrospectives after his death in 1907." provide a valid answer to the question "What year's were Cezannes painting's displayed at Salon d'Automne? Not including the retrospectives."

A:
yes