English distinguishes interrogative pronouns "who" referring to humans and "what" referring to non-humans, and the same distinction is made in Lushootseed, any Bantu languages that I've encountered, Saami, and so on. There might be further subdivisions for grammatical class, number and so on, but as far as I know every language distinguishes at least a wh-pronouns for humans and one for non-humans. Do any languages have a single entity-referring interrogative pronoun, i.e. are "who" and "what" every merged? (Gender or noun-class distinctions suffice to distinguish "who" and "what", when correlated with human/non-human, such as in Ancient Greek).