The Word is:”which”
which
/wɪtʃ/
pronoun & determiner
determiner: which
1. asking for information specifying one or more people or things from a definite set.
“which are the best varieties of grapes for long keeping?”
pronoun & determiner
pronoun: which
1. used referring to something previously mentioned when introducing a clause giving further information.
“a conference in Vienna which ended on Friday”
Source credit: Google
Source credit: Google