Sometimes interrogatives replace nouns altogether, and act as interrogative pronouns that introduce a question. They are:

ITALIAN INTERROGATIVE PRONOUNS
 
ITALIAN
 ENGLISH
 EXAMPLE
 
Chi?
 (Who? Whom?)
 Chi sei?
 
Che/Che cosa/Cosa?
 (What?)
 Cosa dici?
 
Quale?
 (Which (one/s)?)
 Quale giornali vuoi?