Trivia Which is correct: "Who is taller, I or the horse?" or "Which is taller, I or the horse?"?

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“Who” is correct, because when even one human is included in a group of animals, the pronoun switches from “which” to “who.”

Informally, the sentence should be: “Who is taller, I or the horse?”

Formally, it should be: “Who is taller, the horse or I?”