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: Who were the first commander of the regiment Erwin served in during the American Civil War? Passage:Born in Washington, Lycoming County, Pennsylvania, Erwin settled in Portage, Wisconsin in 1853. From 1855 to 1868, Erwin lived in Jo Daviess County, Illinois and then in Stephenson County, Illinois. During the American Civil War, Erwin served in the 45th Illinois Volunteer Infantry Regiment. In 1868, Erwin moved to Tomah, Wisconsin and was in the mercantile business. From 1879 to 1882 and 1886, Erwin served on the Tomah Board of Education and was president of the school board. From 1882 to 1889, Erwin served in the Wisconsin State Senate and was a Republican. In 1889, Erwin served as postmaster for Tomah, Wisconsin. In 1902, Erwin moved with his family to Milwaukee, Wisconsin. Erwin died suddenly in Savanna, Illinois just as he was about get on a train for a trip to Omaha, Nebraska.

Example Output: b

Example Input: Question: Which city is the largest  -  the city near junction K, or the city near junction A? Passage:Belgrade marshalling yard () or Makiš railway station (), or Makiš freight station, is a classification yard of the Belgrade railway junction and the largest railway station in Serbia. It is located in the neighbourhood of Makiš in Čukarica of Belgrade. The railroad continues to Ostružnica in one line via park A, in the other direction to Ostružnica via park B, in third direction to Resnik via junction B near Železnik and junction K of Belgrade railway junction near Petlovo Brdo, in fourth direction to Resnik via junction R in the tunnel below Vidikovac and junction A near Kneževac, in the fifth direction to Rakovica via park B and junction R, in the sixth direction to Rakovica via park A and junction T, in the seventh direction to Rakovica via park B and junction T per second line and the eight towards direction to Jajinci. Belgrade marshalling yard consists of 120 railway tracks.

Example Output: a

Example Input: Question: What country owns the islands that the fleet knew Spanish galleys were in? Passage:In mid-1540 the Barbary pirate Ali Hamet, a Sardinian renegade in service of the Ottoman Empire, formed a small fleet at Algiers, as ordered by Admiral Hayreddin Barbarossa. He assembled three galleys, five galliots, six fustas and two brigantines, manned by 900 captive oarsmen and 2,000 Turkish soldiers and Valencian Moriscos under the command of General Caramani, a former slave in the Spanish galleys. In August, knowing that Spanish galleys were in the Balearic Islands, the fleet set sail to the western waters of the Alborán Sea. A few days later a thousand soldiers from the galleys landed on the beach of Gibraltar and attacked the village. Although they failed to capture the well-protected castle, 73 civilians were taken prisoner, 40 vessels moored in the port were plundered, and a galley under construction (owned by Don Álvaro de Bazán the Elder) was burnt. The prisoners were carried off to Vélez de la Gomera, on the Moroccan coast, where they were imprisoned until their release following a payment of 7,000 ducats.

Example Output:
b