pronoun
what or which person or people - used when you do not know the name or identity of a person or group of people that you are talking about or asking about
b - used to question a person's character or authority
c - used in questions that are meant to say that no one would or would not do something, know something, etc.
usage seewhom</USAGER
used after a noun or pronoun to show which group of people you are talking about
used to introduce an additional statement about someone who has already been mentioned
who's who
or who is who :information about the people who make up a group
a list of the names of the important and well-known people in a particular field
the important and well-known people in a particular field