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.

Q: Question: How long was the fortification that the German Army retreated to? Passage:Adair fought in the First World War. He joined the British Army, receiving his commission as a probationary second lieutenant on 2 May 1916 in the 5th (Reserve) Battalion of the Grenadier Guards. From January 1917 onwards he served in the trenches of the Western Front in France and Belgium as part of the 2nd Company, 3rd Battalion, Grenadier Guards, with the rank of lieutenant. The battalion was part of the 2nd Guards Brigade of the Guards Division. Adair's first major battle was in the pursuit of the retreating German Army to the Hindenburg Line. The division then took part in the Battle of Passchendaele. Adair, however, took no part in the battle, due to an injury sustained in a bicycle accident in early July 1917. He returned to the battalion in January 1918.


A: b
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Q: Question: What year was the treaty that opened up the Korean Peninsula to Japanese trade signed? Passage:Un'yō  was one of the ships dispatched to Kyūshū in 1874 during the Saga Rebellion. In May 1875, she carried diplomats to Busan in Korea in an attempt by the Japanese government to open diplomatic relations with the Joseon dynasty government. After they were rebuffed in these negotiations, the Japanese government again dispatched Un'yō in September 1875 under the command of Inoue Yoshika to provoke a military response, in what was later termed the Ganghwa Island incident. This eventually led to the Treaty of Ganghwa, which opened the Korean Peninsula to Japanese trade. In 1876, Un'yō  was assigned to assist in the suppression of the Hagi Rebellion, another uprising of disaffected former samurai. Un'yō  was severely damaged when she ran aground off the coast of the Kii Peninsula, and was scrapped the following year.


A: b
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Q: Question: In which comic did the retconned hero first appear? Passage:Next, the Aryan Nation plans to release a virus that will kill any non-Aryan in Northern America. The League is capable of infiltrating the group, but are soon compromised when one the Nation's members recognizes Peter Cannon, Thunderbolt. The League eventually manages to escape with the help of Hourman (Rex Tyler) and stop the virus from being spread. After the mission, Hannibal Martin reveals the return of L-Ron, still inhabitting the body of old foe Despero, to warn the team of the coming threat of the Overmaster. Shortly afterward, the Justice League collectively faces the Overmaster, who kills the superheroine Ice in Justice League Task Force #14. During the assault on Overmaster's citadel, Gypsy is left behind in an Arctic wasteland as the main group forged forward, leading her to quit the team after the battle. The Task Force then become embroiled in the Zero Hour conflict, and Triumph, a hero retconned into having been a founding member of the original Justice League, appears and joins the team. After Zero Hour, the Martian Manhunter and L-Ron assemble a new group, making the Task Force a training ground for new heroes, and the team consists of themselves, Triumph, the Ray and a returned Gypsy.


A:
b
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