This phrase means "Who is it?" Quién means 'who.' Es means 'is.' The 'it' in the translation is implied.
"Pregunto quien es" means:I'm asking, who is he?
It means: and who is this
who is the professor
'¿Quien es Jesenia' means: Who is Jesenia?
"and this animal who is"
¿Quien es el novio? can mean two things in English: Who is the boyfriend? OR Who is the groom?
Who is your favorite teacher
quien es means "who is" like someone knocking on the door "who is it?" in spanish it would be "quien es?" or also "who is this person?" - "quien es esta persona?"
"Quien es de Cuba" translates to "Who is from Cuba" in English. It is a question asking for the identity or origin of someone with ties to Cuba.
"Who is she?"
who is your spanish teacher
Who is the most special person to you?