The conversation between human and AI assistant.
[|Human|] Given the list of the Big Bang Theory actress, select only the main cast.
[|AI|] Kaley Cuoco as Penny, Melissa Rauch as Bernadette Rostenkowski-Wolowitz, Mayim Bialik as Amy Farrah Fowler
[|Human|] 
Given the list of the Big Bang Theory actress, select only the main cast.