Generate a correct and concise answer for the question based on the words in the context.

[Q]: Context : Casey's Shadow is a 1978 drama Metrocolor film directed by Martin Ritt and starring Walter Matthau. 
Question : Who are the cast members of Casey's Shadow?
[A]: Walter Matthau


[Q]: Context : Arnulf Blasig (30 December 1913 -- 13 November 1998) was a highly decorated Major in the Luftwaffe during World War II, and a recipient of the Knight's Cross of the Iron Cross. 
Question : Which war did Arnulf Blasig serve in?
[A]: World War II


[Q]: Context : WebGL 1.0 is based on OpenGL ES 2.0 and provides an API for 3D graphics. 
Question : Which is the basis of WebGL?
[A]:
OpenGL ES