Question: The song "Your Mother Should Know" is based on a line from a film released in what year?

full_context: Document 1: Magical Mystery Tour (film): Magical Mystery Tour is a 52-minute-long British surreal comedy television film starring the Beatles (John Lennon, Paul McCartney, George Harrison and Ringo Starr) which originally aired on BBC1 on Boxing Day, 26 December 1967. Upon its initial showing, the film was poorly received by critics and audiences. The film received an American theatrical release in 1974 by New Line Cinema, and in select theatres worldwide in 2012 by Apple Films.
Document 2: Mother (John Lennon song): "Mother" is a song by English musician John Lennon, first released on his 1970 album "John Lennon/Plastic Ono Band". An edited version of the song was issued as a single in the United States on Apple Records, on 28 December 1970. The single runs about 1:41 shorter than the album due to a lack of the tolling bells intro and a quicker fadeout. The B-side features "Why" by Yoko Ono. The song peaked in the US at number 19 on the "Cashbox" Top 100 and number 43 on the "Billboard" Hot 100.
Document 3: A Quick One, While He's Away: "A Quick One, While He's Away" is a 1966 medley written by Pete Townshend and recorded by The Who for their second album "A Quick One". The song also appears on the album "BBC Sessions". In the performance on their "Live at Leeds" album Townshend calls the nine-minute "epic" track a "mini-opera" and introduces it as ""Tommy's" parents".
Document 4: Good Morning Good Morning: "Good Morning Good Morning" is a song written by John Lennon (credited to Lennon–McCartney) and recorded by the Beatles, featured on their 1967 album "Sgt. Pepper's Lonely Hearts Club Band". Inspiration for the song came to Lennon from a television commercial for Kellogg's Corn Flakes. Another reference to contemporary television was the lyric "It's time for tea and "Meet the Wife"", referring to the BBC sitcom.
Document 5: Yellow Submarine (film): Yellow Submarine (also known as The Beatles: Yellow Submarine) is a 1968 British animated musical fantasy comedy film inspired by the music of the Beatles, directed by animation producer George Dunning, and produced by United Artists and King Features Syndicate. Initial press reports stated that the Beatles themselves would provide their own character voices; however, aside from composing and performing the songs, the real Beatles participated only in the closing scene of the film, while their cartoon counterparts were voiced by other actors.
Document 6: The Kitchen (1961 film): The Kitchen is a 1961 black and white British drama film directed by James Hill and starring Carl Möhner, Mary Yeomans, Brian Phelan, Tom Bell, Eric Pohlmann and James Bolam. The film follows an ensemble of the staff in a cafe's kitchen during the course of one busy morning. The script is based on the 1957 stage play of the same name by Arnold Wesker. The film was produced by Sidney Cole for Act Films Ltd.
Document 7: Dear Prudence: "Dear Prudence" is a song by the English rock group the Beatles from their 1968 album "The Beatles" (also known as "the White Album"). The song was written by John Lennon, and credited to Lennon–McCartney. Written in India, it was inspired by Prudence Farrow, a sister of actress Mia Farrow, who became obsessive about meditating while practising with Maharishi Mahesh Yogi.
Document 8: I Should Have Known Better: "I Should Have Known Better" is a song by English rock band the Beatles composed by John Lennon (credited to Lennon–McCartney), and originally issued on "A Hard Day's Night", their soundtrack for the film of the same name released July 10, 1964. "I Should Have Known Better" was issued as the B-side of the U.S. single "A Hard Day's Night" released July 13, 1964. An orchestrated version of the song conducted by George Martin appears on the North American version of the album, "A Hard Day's Night Original Motion Picture Soundtrack."
Document 9: Your Mother Should Know: "Your Mother Should Know" is a song by the Beatles from their 1967 record "Magical Mystery Tour", released in the US as an LP on 27 November 1967 and in the UK as a double-EP on 8 December 1967. It was written by Paul McCartney (credited to Lennon–McCartney) based on a line from the screenplay for "A Taste of Honey".
Document 10: Lucy in the Sky with Diamonds: "Lucy in the Sky with Diamonds" is a song credited to Lennon–McCartney that appears on the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band". It was started by John Lennon, then Paul McCartney contributed to it in a songwriting session. Lennon's son Julian inspired the song with a nursery school drawing he called "Lucy—in the sky with diamonds". Shortly after the song's release, speculation arose that the first letter of each of the title nouns intentionally spelled "LSD". Lennon consistently denied this, insisting the song's fantastical imagery was inspired by Lewis Carroll's "Alice in Wonderland" books, a claim repeatedly confirmed by Paul McCartney.
Document 11: Tie Your Mother Down: "Tie Your Mother Down" is a song by the British rock band Queen, written by lead guitarist Brian May. It is the opening track and the second single from their 1976 album "A Day at the Races". On its original release as a single in 1977 the song peaked at 31 in the UK Singles Chart, however more than 20 years later it was released as a double a-side to "No-One But You (Only the Good Die Young)" where it reached 13 in UK Singles Chart. On the album the song is preceded by a one-minute instrumental intro featuring a Shepard tone melody, which is reprised in the ending of "Teo Torriatte": this was intended to create a "circle" in the album, typical, for example, of Pink Floyd's albums.
Document 12: Poor Cow: Poor Cow is a 1967 British drama film, directed by Ken Loach and based on Nell Dunn's novel of the same name. It was Ken Loach's first feature film, after a series of successful TV productions.
Document 13: A Hard Day's Night (film): A Hard Day's Night is a 1964 British musical comedy film directed by Richard Lester and starring the Beatles—John Lennon, Paul McCartney, George Harrison, and Ringo Starr—during the height of Beatlemania. It was written by Alun Owen and originally released by United Artists. The film portrays several days in the lives of the group.
Document 14: A Taste of Honey (film): A Taste of Honey is a 1961 British film adaptation of the play of the same name by Shelagh Delaney. Delaney wrote the screenplay herself, aided by director Tony Richardson, who had previously directed the play on the stage. It is an exemplar of a gritty genre of British film that has come to be called kitchen sink realism and was the inspiration behind the song "Your Mother Should Know", which is on the 1967 album "Magical Mystery Tour" by The Beatles.
Document 15: My Mummy's Dead: "My Mummy's Dead" is the closing song on the album "John Lennon/Plastic Ono Band" by John Lennon. It was also released on a Mexican EP that also contained "Mother", "Isolation" and "Look at Me."
ground_truth: 1961