WHICH pron.
A interrogative pronoun, used both substantively and adjectively, and in direct and indirect questions, to ask for, or refer to, an individual person or thing among several of a class; as, which man is it which woman was it which is the house he asked which route he should take; which is best, to live or to die See the…
WHO pron.
Originally, an interrogative pronoun, later, a relative pronoun also; -- used always substantively, and either as singular or plural. See the Note under What, pron., 1. As interrogative pronouns, who and whom ask the question: What or which person or persons Who and whom, as relative pronouns (in the sense of that), ar…