I have seen phrases like
But I feel that 'which' is a more appropriate pronoun for living things.Why not 'which' has been used there?
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Which is ordinarily used when asking for the identity of a specific member or members of a known group:
A: The government said they would release three prisoners.
B: Which prisoners? There are over a hundred of them.
What is ordinarily used when asking for the identity of somebody previously unknown.
A: The government said they would release three of the prisoners.
B: What prisoners? There should be no prisoners; they said last fall they had released them all.