Problem: Given the question: Extract the answer to the question from the following context. Question: Why were Sturgeon and the other DC motor inventors unsuccessful? Context: The first commutator DC electric motor capable of turning machinery was invented by the British scientist William Sturgeon in 1832. Following Sturgeon's work, a commutator-type direct-current electric motor made with the intention of commercial use was built by the American inventor Thomas Davenport, which he patented in 1837. The motors ran at up to 600 revolutions per minute, and powered machine tools and a printing press. Due to the high cost of primary battery power, the motors were commercially unsuccessful and Davenport went bankrupt. Several inventors followed Sturgeon in the development of DC motors but all encountered the same battery power cost issues. No electricity distribution had been developed at the time. Like Sturgeon's motor, there was no practical commercial market for these motors.
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The answer is:
there was no practical commercial market for these motors

Problem: Given the question: Extract the answer to the question from the following context. Question: LED stands for what? Context: In recent years light emitting diodes (LEDs) are becoming increasingly efficient leading to an extraordinary increase in the use of solid state lighting. In many situations, controlling the light emission of LEDs may be done most effectively by using the principles of nonimaging optics.
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The answer is:
light emitting diodes

Problem: Given the question: Extract the answer to the question from the following context. Question: What was one of the primary factors or driving forces for the quick expansion of the 70's film creation and popularity in Somalia cinema? Context: Growing out of the Somali people's rich storytelling tradition, the first few feature-length Somali films and cinematic festivals emerged in the early 1960s, immediately after independence. Following the creation of the Somali Film Agency (SFA) regulatory body in 1975, the local film scene began to expand rapidly. The Somali filmmaker Ali Said Hassan concurrently served as the SFA's representative in Rome. In the 1970s and early 1980s, popular musicals known as riwaayado were the main driving force behind the Somali movie industry. Epic and period films as well as international co-productions followed suit, facilitated by the proliferation of video technology and national television networks. Said Salah Ahmed during this period directed his first feature film, The Somali Darwish (The Somalia Dervishes), devoted to the Dervish State. In the 1990s and 2000s, a new wave of more entertainment-oriented movies emerged. Referred to as Somaliwood, this upstart, youth-based cinematic movement has energized the Somali film industry and in the process introduced innovative storylines, marketing strategies and production techniques. The young directors Abdisalam Aato of Olol Films and Abdi Malik Isak are at the forefront of this quiet revolution.
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The answer is:
SFA