¿Quién es?

Appropriate response to this?

Quien es means who is it

Explain

if it's someone asking you who is it mostly use "el/ella es "

                                                                                    he  or  she is __

                                                                                      (introduce)

example: ella es selena gomez

but for example if it's you knocking on someones door and they ask "quien es" introduce yourself "hola es natalie"

what are the options? then i will gladly you.