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.

Input: Consider Input: Question: Who was the last leader of the the country that was established after the year-long siege in 831? Passage:At the time of his accession, Theophilos was obliged to wage wars against the Arabs on two fronts. Sicily was once again invaded by the Arabs, who took Palermo after a year-long siege in 831, established the Emirate of Sicily, and gradually continued to expand across the island. The defence after the invasion of Anatolia by the Abbasid Caliph Al-Ma'mun in 830 was led by the Emperor himself, but the Byzantines were defeated and lost several fortresses. In 831 Theophilos retaliated by leading a large army into Cilicia and capturing Tarsus. The Emperor returned to Constantinople in triumph, but in the autumn he was defeated in Cappadocia. Another defeat in the same province in 833 forced Theophilos to sue for peace (Theophilos offered 100,000 gold dinars and the return of 7,000 prisoners), which he obtained the next year, after the death of Al-Ma'mun.


Output: b


Input: Consider Input: Question: Have Liverpool or Chelsea won more titles? Passage:Arsenal had finished the previous season as runners-up in the Premier League, overhauled by Manchester United in the final ten weeks of the season. The club did, however, retain the FA Cup, with a 1–0 win against Southampton. Such was Arsenal's effective start to the 2002–03 campaign, manager Arsène Wenger suggested his team could remain the whole season undefeated in all competitions:It's not impossible as A.C. Milan once did it but I can't see why it's so shocking to say it. Do you think Manchester United, Liverpool or Chelsea don't dream that as well? They're exactly the same. They just don't say it because they're scared to look ridiculous, but nobody is ridiculous in this job as we know anything can happen. The team lost to Everton a month after Wenger's proclamation; teenager Wayne Rooney scored the match winner, which ended a run of 30 league games without defeat. By February 2003, Arsenal moved five points clear of Manchester United at the top of the league table, but injuries to key players, not least captain Patrick Vieira, had destabilised the team. Draws in April, coupled with a defeat to Leeds United at home, mathematically ended Arsenal's chances of retaining the title. Wenger refuted opinions from the media that their season was a failure and said: 


Output: b


Input: Consider Input: Question: Who was the leader of the British Conservative Party in 1991? Passage:Founded in 1991 as the pro-free market wing of the Civic Forum by Václav Klaus and modelled on the British Conservative Party, the ODS won the 1992 legislative election, and has remained in government for most of the Czech Republic's independence. In every legislative (except for the 2013 election) it emerged as one of the two strongest parties. Václav Klaus served as the first Prime Minister of the Czech Republic after the partition of Czechoslovakia, from 1993 to 1997. Mirek Topolánek, who succeeded him as leader of the party in December 2002, served as Prime Minister from 2006 to 2009. In the 2010 election, the party lost 28 seats, finishing second, but as the largest party right of the centre, it formed a centre-right government with Petr Nečas as Prime Minister. In the 2013 legislative election, the party was marginalized by only securing 16 seats in the Chamber of Deputies, relegating the party to the opposition since July 2013. In the 2017 legislative election, it has partly recovered and secured 25 seats in the Chamber of Deputies, making it the second strongest party in chamber. The party is currently being led by Petr Fiala, who has been leader since the 2014 party convention.



Output: b