adrianus wrote:No. A demonstrative pronoun designates or points out. "Qui/quae/quod" ("what kind of/which?") in this question is an interrogative adjective relative pronoun; "quis/quis/quid" ("who/what?") is a substantive interrogative relative pronoun.
Oops. You're right that it isn't a demonstrative.
However, I would not call either of them relative pronouns. A relative pronoun is used to form a relative clause, and simple interrogatives such as "Quis clāmat?" or "Quī puer clāmat?" are not relative clauses. "Adjective pronoun" also strikes me as an oxymoron (since "pronoun" is a part of speech, and a word cannot belong to more than one part of speech at a time); I'd call them an "interrogative adjective" and an "interrogative pronoun". (The term "pro-adjective" exists, but I don't think I've heard it until I looked into this today.)