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

[EX Q]: Context : The film was adapted by Wilder and Edwin Blum from the Broadway play by Donald Bevan and Edmund Trzcinski which was based on their experiences as prisoners in Stalag 17B in Austria.
Question : The Stalag 17 is based upon what?
[EX A]: Donald Bevan

[EX Q]: Context : The 2015 Belgian Grand Prix (formally the 2015 Formula 1 Shell Belgian Grand Prix) was a Formula One motor race held on 23 August 2015 at the Circuit de Spa-Francorchamps in Spa, Belgium.
Question : On what date did 2015 Belgian Grand Prix occur?
[EX A]: 23 August 2015

[EX Q]: Context : Sir Thomas de Brus (c. 1284 -- 9 February 1307) was a younger brother of King Robert I of Scotland, who supported his brother in the struggle for the crown of Scotland.
Question : What year did Thomas de Brus die?
[EX A]:
9 February 1307