Phrase 'which pupil' (Which pupil speaks English the best?)

[Jon]

Hi all,

I understand that which is used with thing (who, that for persons), but in the sentence:

"Which pupil speaks English the best?"

It is correct the use of which here?
It sound to me very bad, but It is grammatically adequate to use Who?

Thanks in advance...

[Mister Micawber]

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'Which pupil' is fine- 'which' is an adjective, not a pronoun, here and can be used for both persons and things. 'Who speaks' is OK, but would have the same meaning only if the context indicated that the speaker was discussing pupils.
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Native English teacher at Mister Micawber's