Quale? is used to indicate people, animals, or things. It expresses "What is...?" when the answer involves a choice, or when one requests information such as a name, telephone number, or address. Quale? is invariable in gender. Quale di voi ha studiato a Parigi? Quale vuoi conservare di queste due fotografie?

Interrogative Prepositions

In Italian, a question never ends with a preposition. Prepositions such as a, di, con, and per always precede the interrogative chi (who).

A chi scrivi? (To whom are you writing?)

Di chi sono queste chiavi? (Whose keys are these?)

Con chi escono stasera? (Who(m) are they going out with tonight?)