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 Input: Question: Which city had a greater population the year Gordon led his regiment to the Battle of Marks' Mills, Little Rock or Camden? Passage:In March and April 1864, Shelby's men harassed and skirmished with the Union Army force under the command of Major General Frederick Steele during his Camden Expedition, part of the Red River Campaign. Gordon led more than one charge against the Union forces during Steele's march from Little Rock to Camden, Arkansas. On April 25, 1864, Gordon led his regiment at the Battle of Marks' Mills where they captured two Union artillery pieces from the detachment of Union Lieutenant Colonel Francis M. Drake when Shelby's force attacked the Union left wing of the detachment which had been sent from Camden toward Pine Bluff, Arkansas to obtained supplies for Steele's force which was increasingly besieged by gathering Confederate forces at Camden. The Confederates outnumbered the Union force at Marks' Mills by more than 2 to 1 and overwhelmed it, taking about 1,300 prisoners and about 240 wagons. The overall commander of the Confederate cavalry force at Marks' Mills, Brigadier General James Fagan, led the Confederates, including Shelby's command, toward Pine Bluff in an effort to capture the Union supply depot. The Confederates did not make it to Pine Bluff due to flooding. They also did not return fast enough to cut off Steele's return march to Little Rock or to participate in the Battle of Jenkins' Ferry, the one big engagement during the retreat before the Union troops escaped across the swollen Saline River.

Example Output: a

Example Input: Question: Which North American city hall building that used Superblocks was completed first? Passage:Superblocks are also used when functional units such as rail yards or shipyards, inherited from the 19th and early 20th centuries, are too big to fit in an average city block. A contemporary function which reflects ancient practices that also requires larger than typical blocks is the sports stadium or arena. Just as the Colosseum in ancient Rome, sports complexes require superblocks. The Providence Park stadium in Portland, for example, takes up four normal city blocks as does the equally large Greensboro Coliseum in North Carolina. Other contemporary institutions, establishments or functions that use superblocks are: city halls like Government Center, Boston and Toronto City Hall; regional general hospitals or specialized medical centres; convention and exhibition centers, such as Exhibition Place in Toronto and the Boston Convention and Exhibition Center; and downtown enclosed Shopping Malls such as Eaton Centre in Toronto, echoing the large gallerias of the 19th century. Cultural complexes, such as the Lincoln Center in New York City, often occupy a superblock achieved through the consolidation of regular city blocks. A recent superblock user is the merchandise distribution centre, which can range in area from one to ten city blocks.

Example Output: a

Example Input: Question: How old was John Brown when Harris wrote a letter to him? Passage:Harris was born in Smithfield, Rhode Island in 1801 and at a young age moved with his parents to Dutchess County, New York where he worked on the family farm and taught school. In 1818 he moved to Ashtabula County, Ohio, but he returned to Rhode Island in 1823 and started working with his uncles William Harris and Samuel Harris in their manufacturing businesses at Valley Falls, Rhode Island and then Albion, Rhode Island. In 1831 Edward Harris started his own small mill in Woonsocket. He eventually built several other successful larger mills in Woonsocket. Harris made large donations to many public causes in Woonsocket, including new roads for the city, the land for Woonsocket High School, the site of Oak Hill Cemetery, and the Harris Institute (a library and auditorium for speakers), which became Woonsocket Harris Public Library, and the former Harris Institute building is now Woonsocket City Hall. Harris served in the Rhode Island State Senate and House of Representatives and was a strong abolitionist and temperance supporter. In the 1840s he ran for governor as the Liberty Party candidate advocating for abolitionism. In 1859 Harris wrote a letter and sent a check to John Brown after his conviction. Harris hosted Abraham Lincoln at his North End home when Lincoln spoke at the Harris Institute in 1860. Harris was married to Rachel Farnham and then after her death to Abby Metcalf and had children in both marriages. Harris died in Woonsocket in 1871. Besides the Harris Institute (Woonsocket City Hall), several of the buildings, which Harris constructed, survive, including Harris Warehouse (1855).

Example Output:
b