[Q]: Sentence: In September 1961, while working at Texas Instruments in Dallas, Texas, James R. Biard and Gary Pittman discovered near-infrared (900 nm) light emission from a tunnel diode they had constructed on a GaAs substrate. Question: What type of diode was used to help discover near-infrared light emission?
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[A]: yes

[Q]: Sentence: The city was also home to the Royal Naval Engineering College; opened in 1880 in Keyham, it trained engineering students for five years before they completed the remaining two years of the course at Greenwich. Question: In what year did the Dockyard Technical College close?
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[A]: no

[Q]: Sentence: One year earlier Hitachi introduced an expensive industrial player with a laser diode, but the player, which had poor picture quality due to an inadequate dropout compensator, was made only in limited quantities. Question: Which company continued to use gas-lasers in industrial models of LD players although they were no longer used in consumer models?
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[A]:
no