Context and question: Beyoncé further expanded her acting career, starring as blues singer Etta James in the 2008 musical biopic, Cadillac Records. Her performance in the film received praise from critics, and she garnered several nominations for her portrayal of James, including a Satellite Award nomination for Best Supporting Actress, and a NAACP Image Award nomination for Outstanding Supporting Actress. Beyoncé donated her entire salary from the film to Phoenix House, an organization of rehabilitation centers for heroin addicts around the country. On January 20, 2009, Beyoncé performed James' "At Last" at the First Couple's first inaugural ball. Beyoncé starred opposite Ali Larter and Idris Elba in the thriller, Obsessed. She played Sharon Charles, a mother and wife who learns of a woman's obsessive behavior over her husband. Although the film received negative reviews from critics, the movie did well at the US box office, grossing $68 million—$60 million more than Cadillac Records—on a budget of $20 million. The fight scene finale between Sharon and the character played by Ali Larter also won the 2010 MTV Movie Award for Best Fight.
Which song did Beyonce sing at the first couple's inaugural ball? 
Answer: At Last
Context and question: The economy is a mixture of village agriculture and handicrafts, an industrial sector based largely on petroleum, support services, and a government characterized by budget problems and overstaffing. Petroleum extraction has supplanted forestry as the mainstay of the economy. In 2008, oil sector accounted for 65% of the GDP, 85% of government revenue, and 92% of exports. The country also has large untapped mineral wealth.
What is the smallest part of the industrial sector?
Answer: unanswerable
Context and question: In additive color devices such as computer displays and televisions, one of the primary light sources is typically a narrow-spectrum yellowish-green of dominant wavelength ~550 nm; this "green" primary is combined with an orangish-red "red" primary and a purplish-blue "blue" primary to produce any color in between – the RGB color model. A unique green (green appearing neither yellowish nor bluish) is produced on such a device by mixing light from the green primary with some light from the blue primary.
What are examples of devices that do not use additive systems?
Answer:
unanswerable