Instructions: 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: Question: Who was the leader of Yugoslavia in 1923? Passage:In 1923 it was organised the first edition of leagues in the Kingdom of Yugoslavia where, beside the top-level national Yugoslav Football Championship, regional championships were also played. The clubs of the Drina Banovina, part of Littoral Banovina and Vrbas Banovina, territorially similar to present day Bosnia and Herzegovina, played within the Sarajevo Football Subassociation League until 1939. The champions of Subassociation Leagues were granted a place in the qualifiers to the Yugoslav Championship, a top national level. SASK (1923, 1924, 1925, 1926, 1927, 1928, 1930/31), Slavija (1929, 1930, 1932/33, 1934/35, 1935/36, 1936/37, 1937/38, 1938/39, 1939/40), FK Krajisnik Banja Luka (1935/36) were the clubs to manage to participate in the national league, first in 1923 when the championship was played in a cup system. In 1939 the Yugoslav league system was changed, with the creation of separate Serbian and Croato-Slovenian Leagues which will serve as qualifying leagues for the final phase of the Yugoslav Championship. The clubs from the Sarajevo Subassociation played their qualifications to the Serbian League, however Slavija Sarajevo managed to participate, in 193940 (3rd place) and 194041 (9th place) and played their qualifications to the Croatian-Slovenian League, however SASK managed to participate, and it did it in both occasions, in 193940 (5th place) and 194041 (5th place). That became the last season before the beginning of the Second World War.

Output:
b