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.

Ex Input:
Question: Who was the president of Atlantic Records in 1961? Passage:Ain't She Sweet was an American album featuring four tracks recorded in Hamburg in 1961 by The Beatles featuring Tony Sheridan (except for the title song with vocal by John Lennon) and cover versions of Beatles and British Invasion-era songs recorded by the Swallows. As Atlantic Records only had rights to four Sheridan/Beatle recordings recorded by Polydor Records, they filled the rest of the album with Beatle and British Invasion cover songs. When this material was released by Atco Records, there were mono (catalogue number 33-169) and stereo (SD 33-169) editions. Atco also added additional drum overdubs to the four Sheridan cuts on top of the original drum tracks. American drummer Bernard Purdie claims to have performed overdubs of unspecified Beatles records, which would most likely have been for Ain't She Sweet, but this has never been officially confirmed.

Ex Output:
a

Ex Input:
Question: Does the town where McJunkin was born have more than 1,000 people living in it? Passage:Born to slaves in Midway, Texas, McJunkin was approximately 9 years old when the Civil War ended. He worked as a cowboy for freighters. He reportedly learned how to read from fellow cow punchers. McJunkin taught himself to read, write, speak Spanish, play the fiddle and guitar, eventually becoming an amateur archaeologist and historian. In 1868, McJunkin arrived in New Mexico and became a foreman on the Thomas Owens Pitchfork Ranch. McJunkin became a buffalo hunter and worked for several ranches in Colorado, New Mexico and Texas. He was also reported to be an expert bronc rider and one of the best ropers in the United States. He became foreman of the Crowfoot ranch near Folsom, New Mexico. In 2019, he was inducted into the Hall of Great Westerners of the National Cowboy & Western Heritage Museum.

Ex Output:
b

Ex Input:
Question: How long is the river that the trail could bring travelers west toward? Passage:Reports from the fur trappers who first entered the mountains and those following mention the trail through the pass as being in long term us by the Shoshone, Bannack, Arapaho, Gros Ventre, Flat Head or Bitterroot Salish, Nez Perce, Crow and others. The pass provide access into three river sheds. An east-west route ran from the east up the Wind River valley and provided a western route by the Gros Ventre or Hoback Rivers to the Valley of the Snake River in Jackson's Hole. To go south, the traveler would follow the Green River. The Union Pass Route was an extension of a North South Route up the Valley of the Yellowstone. Coming up the Valley of the Thoroughfare, west of the Absaroka Mountains and south of Yellowstone Lake, the trail followed the North Fork of the Yellowstone. Crossing over Two Ocean Pass, the trail split east and west around Terrace Mountain into the Wind River Valley at DuNoir. From Union Pass south bound travelers could use the Green River Valley to connect east through South Pass or west toward the Snake River.

Ex Output:
b