Does the sentence "This theorem establishes that in zero-sum games with perfect information (i.e. in which players know at each time all moves that have taken place so far), there exists a pair of strategies for both players that allows each to minimize his maximum losses, hence the name minimax." provide a valid answer to the question "What year was game theory established?" OPTIONS:
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A: no

Does the sentence "In January 2010, Obama proposed additional regulations limiting the ability of banks to engage in proprietary trading." provide a valid answer to the question "Regulations were proposed by Obama in January 2010 to limit the ability of banks to engage in which type trading?" OPTIONS:
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A: yes

Does the sentence "Eritrea denied the claims." provide a valid answer to the question "What did Eritrea do when it was accused of planting bombs at the African Union summit?" OPTIONS:
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- no

A: yes

Does the sentence "In 1980 the PAIGC acknowledged in its newspaper No Pintcha (dated 29 November 1980) that many Gueinean soldiers had been executed and buried in unmarked collective graves in the woods of Cumera, Portogole, and Mansaba." provide a valid answer to the question "When did the PAIGC acknowledge the executions?" OPTIONS:
- yes
- no

A:
yes