What is the incorrect pronoun to this sentence my friends and I went museum where they saw modern art exhibit?

Here's why:

* "They" refers to a group of people other than the speaker and their friends. The sentence is about the speaker and their friends going to the museum.

* The correct pronoun is "we" because it includes the speaker and their friends.

Here's the corrected sentence:

My friends and I went to the museum where *we* saw a modern art exhibit.