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Which vs. Who

See complete definition in Reverso Define, with examples
which
Definition

interrogative pronoun, used both substantively and adjectivally, and in direct and indirect questions, to ask for, or refer to, an individual person or thing among several of a class

Examples

which one is it?

See complete definition in Reverso Define, with examples
who
Definition

the person or persons that; the one that

Examples

I'm the one who bought it