[Q]: Question: "Which has the least initial expense, fluorescent lamps or incandescent light bulbs, or LED lamps?" Context: "Objections to banning the use of incandescent light bulbs include the higher initial cost of alternatives and lower quality of light of fluorescent lamps. Some people have concerns about the health effects of fluorescent lamps. However, even though they contain mercury, the environmental performance of CFLs is much better than that of light bulbs, mostly because they consume much less energy and therefore strongly reduce the environmental impact of power production. LED lamps are even more efficient, and are free of mercury. They are regarded as the best solution in terms of cost effectiveness and robustness." Answer:
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[A]: incandescent light bulbs

[Q]: Question: "Not having hereditary juridical status, which determined nobility, did not stop these people from prospering." Context: "As some szlachta were poorer than some non-noble gentry, some particularly impoverished szlachta were forced to become tenants of the wealthier gentry. In doing so, however, these szlachta retained all their constitutional prerogatives, as it was not wealth or lifestyle (obtainable by the gentry), but hereditary juridical status, that determined nobility." Answer:
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[A]: non-noble gentry

[Q]: Question: "Who is behind the ASCII standard?" Context: "ASCII developed from telegraphic codes. Its first commercial use was as a seven-bit teleprinter code promoted by Bell data services. Work on the ASCII standard began on October 6, 1960, with the first meeting of the American Standards Association's (ASA) X3.2 subcommittee. The first edition of the standard was published during 1963, underwent a major revision during 1967, and experienced its most recent update during 1986. Compared to earlier telegraph codes, the proposed Bell code and ASCII were both ordered for more convenient sorting (i.e., alphabetization) of lists, and added features for devices other than teleprinters." Answer:
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[A]: ASA

[Q]: Question: "What's most important to plant growth" Context: "Light is the signal by which plants synchronize their internal clocks to their environment and is sensed by a wide variety of photoreceptors. Red and blue light are absorbed through several phytochromes and cryptochromes. One phytochrome, phyA, is the main phytochrome in seedlings grown in the dark but rapidly degrades in light to produce Cry1. Phytochromes BE are more stable with phyB, the main phytochrome in seedlings grown in the light. The cryptochrome (cry) gene is also a light-sensitive component of the circadian clock and is thought to be involved both as a photoreceptor and as part of the clock's endogenous pacemaker mechanism. Cryptochromes 12 (involved in blueUVA) help to maintain the period length in the clock through a whole range of light conditions." Answer:
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[A]:
Light