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 people could Stamford Bridge seat the year York joined Aston Villa? Passage:York started his career with Handsworth Royal, Birchfield Rangers and the Royal Air Force, and also guested for Chelsea during World War I. In March 1915 he joined Aston Villa as an amateur, signing professional forms in August 1919. He scored one goal in 17 games in 191920, but did not feature in the 1920 FA Cup Final, which ended in a 10 victory over Huddersfield Town at Stamford Bridge. He appeared just 11 times in 192021, before going on to make 47 appearances in the 192122 campaign, as the "Villans" finished fifth in the First Division. He scored nine goals in 37 games in 192223 and five goals in 43 games in 192324. He also appeared at Wembley in the 1924 FA Cup Final, in a 20 defeat to Newcastle United. He scored seven goals in 34 matches in 192425, before hitting 20 goals in 44 appearances in 192526. He bagged 13 goals in 43 games in 192627, before being limited to just four goals in 30 appearances in 192728. He rediscovered his scoring form with 18 strikes in 48 matches in 192829, before hitting seven goals in 32 games in 192930. However he played just four times in the 193031 campaign, as Villa finished second in the league with an English record of 128 top-flight league goals scored.

Ex Output:
a

Ex Input:
Question: What country did Commandino study in? Passage:Born in Urbino, he studied at Padua and at Ferrara, where he received his doctorate in medicine. He was most famous for his central role as translator of works of ancient mathematicians. In this, his sources were primarily written in Greek and secondarily in Arabic, while his translations were primarily in Latin and secondarily in Italian. He was responsible for the publication of many treatises of Archimedes. He also translated the works of Aristarchus of Samos (On the sizes and distances of the Sun and the Moon), Pappus of Alexandria (Mathematical collection), Hero of Alexandria (Pneumatics), Ptolemy of Alexandria (Planisphere and Analemma), Apollonius of Perga (Conics) and Euclid of Alexandria (Elements). Among his pupils was Guidobaldo del Monte and Bernardino Baldi. Commandino maintained a correspondence with the astronomer Francesco Maurolico. The proposition known as Commandino's theorem first appears in his work on centers of gravity.

Ex Output:
b

Ex Input:
Question: What countries were part of the pact that saw prefabricated concrete structures modernized? Passage:Four days before the end of the Second World War, undefended Bergen was occupied by the Red Army on 4 May 1945. After the German Democratic Republic (East Germany) was founded, the new government pressed ahead with further industrialization. In 1952, construction began on the industrial area on the town's western outskirts. From 1953 to 1958, the dairy was established, which furnished 300tonnes of milk daily. In 1955/1956 came the establishment of the VEB Brot- und Backwaren (Bread and Baked Goods). In 1957/1958, the slaughterhouse and meat plant went into production. An efficient food industry was set up in Bergen, supplied from the island and parts of the mainland. Since Reunification and East Germany's accession into the Federal Republic, the town has undergone a number of marked changes. The population dwindled from its former level of almost 20,000 to 16,500. Many prefabricated concrete structures, common in the former Warsaw Pact countries, were modernized and adapted to new demands. In addition, a few schools were closed and new hotels built. Historical downtown was completely renovated and decorated, giving it a new appeal.

Ex Output:
a