[Q]: Sentence: During the regency of Maria Cristina, Espartero ruled Spain for two years as its 18th Prime Minister from 16 September 1840 to 21 May 1841. Question: When did Espartero rule?
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[A]: yes

[Q]: Sentence: The outbreak of World War I in 1914 was precipitated by the rise of nationalism in Southeastern Europe as the Great Powers took up sides. Question: When did a victor emerge in World War I?
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[A]: no

[Q]: Sentence: In 1960, Ali Javan co-invented the first gas laser, and fuzzy set theory was introduced by Lotfi Zadeh. Question: When did Ali Javan, an Iranian scientist, co-invent the first gas laser?
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[A]:
yes