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: How many siblings did Khalid have in total? Passage:Khalid was a member of the Shayban tribe, dominant in the region of Diyar Bakr in the northern Jazira, and third son of Yazid ibn Mazyad al-Shaybani, who served twice as Arab governor (ostikan) of Arminiya (a large province encompassing the whole of Transcaucasia). Khalid served in the same office no less than four times: in 813/814, 828832, briefly in 841 and again under Caliph al-Wathiq (r. 842845). In his first tenure, he showed himself conciliatory towards the native Christian population and the nakharar princes, but his second tenure was marked by the brutal suppression of several revolts by local Arab magnates, as well as the harsh treatment of the Christian population. As a result, when his re-appointment to the office was announced in 841, a rebellion broke out, forcing the Abbasid government to recall him immediately. Nevertheless, al-Wathiq assigned Arminiya to Khalid. The latter arrived in the province at the head of an army, and crushed any opposition. He died soon after at Dvin, where he was buried. He was succeeded by his son, Muhammad. His younger son Haytham ibn Khalid ruled in the family's stronghold of Shirvan, and was the first to claim the title of Shirvanshah.

Ex Output:
a

Ex Input:
Question: When was the building where the heads of the major railroads met in 1883 erected? Passage:In 1870, Charles F. Dowd proposed four time zones based on the meridian through Washington, DC for North American railroads. In 1872. he revised his proposal to base it on the Greenwich meridian. Sandford Fleming, a Scottish-born engineer operating in Canada, proposed worldwide Standard Time at a meeting of the Royal Canadian Institute on February 8, 1879. Cleveland Abbe advocated standard time to better coordinate international weather observations and resultant weather forecasts, which had been coordinated using local solar time. In 1879 he recommended four time zones across the contiguous United States, based upon Greenwich Mean Time. The General Time Convention (renamed the American Railway Association in 1891), an organization of US railroads charged with coordinating schedules and operating standards, became increasingly concerned that if the US government adopted a standard time scheme it would be disadvantageous to its member railroads. William F. Allen, the Convention secretary, argued that North American railroads should adopt a five-zone standard, similar to the one in use today, to avoid government action. On October 11, 1883, the heads of the major railroads met in Chicago at the Grand Pacific Hotel and agreed to adopt Allen's proposed system.

Ex Output:
b

Ex Input:
Question: What city was the bowl game in that the Bears defeat the Air Force? Passage:At the beginning of the season, Cal jumped out to a 50 start, their best since 2007. In Week 3, the Bears traveled to Austin to defeat the Texas Longhorns 4544, marking the program's first-ever victory over Texas. The following week, Cal beat the Washington Huskies 3024, Cal's first victory in Seattle since 2005, snapping a six-game losing streak to Washington. Cal then went on to lose five of its next six games, including losses to rivals UCLA, USC, Oregon, and a 13-point loss to arch-rival Stanford. But in a 5424 win over the last place Oregon State Beavers, Cal gained a school-record of 760 yards, while becoming bowl-eligible for the first time since 2011. With a 4846 win over Arizona State on Senior Day, Cal finished the regular season with a 75 record, clinching their first winning season since 2011. They finished the year 85 including a 5536 victory over Air Force in the Armed Forces Bowl. Nevertheless, at 4-5 Cal finished with a losing Pac-12 the record for the third time in three years. That year was also the last year for quarterback Jared Goff, leaving as a junior he was the starting quarterback for three years, beginning the same year as Dykes' initial season. During those three seasons he set 26 team records. Taken by the Los Angeles Rams Goff was the first overall pick of the 2016 NFL Draft; he went on to lead the Rams to the 2019 Super Bowl. Following that season and due to academic and athletic improvements, Dykes' contract was extended until 2019.

Ex Output:
b