IN: Which person is she?
The nurse gave the girl a lollypop because she had too many.
OUT: The nurse

IN: Which person is he?
Steve Ballmer took over as CEO of Microsoft after Bill Gates because he was a unicorn.
OUT: Steve Ballmer

IN: Which person is he?
The boy laughed at his friend because he made the joke.
OUT: his friend

IN: Which person is it?
A person is more productive on an IDE than a text editor, therefore it should be used in general practice.
OUT:
an IDE