Task: Question Understanding
Input (English): Context : Shrek is a 2001 American computer-animated fantasy-comedy film produced by PDI/DreamWorks, released by DreamWorks Pictures, directed by Andrew Adamson and Vicky Jenson, featuring the voices of Mike Myers, Eddie Murphy, Cameron Diaz, and John Lithgow. 
Question : What production company or companies created Shrek?
Output (English): production company