Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: What year did Bolivia and Paraguay go to war over the Gran Chaco? Passage:When Peru and Colombia disputed over a town in the headwaters of the Amazon, Lester presided over the committee which found an equitable solution. He also presided over the less successful committee when Bolivia and Paraguay went to war over the Gran Chaco. In 1933, Lester was seconded to the League's Secretariat and sent to Danzig (now Gdańsk, Poland), as the League of Nations' High Commissioner from 1934 to 1937. The Free City of Danzig was the scene of an emerging international crisis between Nazi Germany and the international community over the issue of the Polish Corridor and the Free City's relationship with the Third Reich. During this period Lester repeatedly protested to the German government against its persecution and discrimination of the Jews and warned the League of the looming disaster for Europe. For this reason he was boycotted by both the representatives of the German Reich and the representatives of the Nazi Party in Danzig.


b