Which of these fruits is in the title of a famous song by The Beatles?

"Strawberry Fields Forever" is a song by the English rock band the Beatles, credited to Lennon–McCartney. It was released on 13 February 1967 as a double A-side single with "Penny Lane". It represented a departure from the group's previous singles and a novel listening experience for the contemporary pop audience. While the song initially divided and confused music critics and the group's fans, it proved highly influential in the emerging psychedelic genre.

Source: Wikipedia