For which film did Reese Witherspoon win the Oscar for Best Actress?

Who won the Oscar for Best Actress for 'Monster'? For which film did Charlize Theron win the Oscar for Best Actress? Who won the Oscar for Best Actress for 'Million Dollar Baby'? Who won the Oscar for Best Actress for 'Walk the Line'? Who won the Oscar for Best Actress for 'The Queen'? For which film did Helen Mirren win the Oscar for Best Actress? Who won the Oscar for Best Actress for 'La Vie en Rose'? For which film did Marion Cotillard win the Oscar for Best Actress?