There is plenty of scope for confusion here. The question asked who sang the lyrics, not who the recording (or even the best–known recording) was credited to. The correct answer to this question was "John Lennon".
I'm not saying that "the Beatles" shouldn't have been allowed, but the question setter needs to know what answer he or she is expecting – otherwise how is the question asker, let alone the answerer, supposed to know?
"John Lennon" should have at least been allowed as an alternative answer – as "Freddie Mercury" was for Question 2.
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