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.
Example: Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? Passage: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
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Example solution: a
Example explanation: The passage describes the 704th's actions during Operation Market Garden so only information about the operation is needed.

Problem: 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.


Solution: b