Sara Gilbert -- What's Up ... With Your BS Answer

Either Sara Gilbert was trying to be nice Friday night in Hollywood ... or like the rest of the country, she only knows one 4 Non Blondes song.

In case you missed it -- it's ok, we forgive you -- Sarah's wife Linda Perry announced this week she was reuniting her 90's band for a charity benefit ... even though they only had one hit -- "What's Up."

We asked Sarah what her favorite Non Blondes song was and her answer is questionable.

Hey, hey, hey, hey.