[Q]: Question: "What kind of living thing is used to describe living together?" Context: "Symbiosis (from Greek "together" and "living") is close and often long-term interaction between two different biological species. In 1877 Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."" Answer:
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[A]: lichens

[Q]: Question: "What happens when antibacterial resistant genes are exchanged between different bacterial strains or species by plasmids that carry resistance genes?" Context: "Several molecular mechanisms of antibacterial resistance exist. Intrinsic antibacterial resistance may be part of the genetic makeup of bacterial strains. For example, an antibiotic target may be absent from the bacterial genome. Acquired resistance results from a mutation in the bacterial chromosome or the acquisition of extra-chromosomal DNA. Antibacterial-producing bacteria have evolved resistance mechanisms that have been shown to be similar to, and may have been transferred to, antibacterial-resistant strains. The spread of antibacterial resistance often occurs through vertical transmission of mutations during growth and by genetic recombination of DNA by horizontal genetic exchange. For instance, antibacterial resistance genes can be exchanged between different bacterial strains or species via plasmids that carry these resistance genes. Plasmids that carry several different resistance genes can confer resistance to multiple antibacterials. Cross-resistance to several antibacterials may also occur when a resistance mechanism encoded by a single gene conveys resistance to more than one antibacterial compound." Answer:
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[A]: The spread of antibacterial resistance

[Q]: Question: "What dropped significantly lower than expected?" Context: "The continuing decline influenced further changes for season 14, including the loss of Coca-Cola as the show's major sponsor, and a decision to only broadcast one, two-hour show per week during the top 12 rounds (with results from the previous week integrated into the performance show, rather than having a separate results show). On May 11, 2015, prior to the fourteenth season finale, Fox announced that the fifteenth season of American Idol would be its last. Despite these changes, the show's ratings would decline more sharply. The fourteenth season finale was the lowest-rated finale ever, with an average of only 8.03 million viewers watching the finale." Answer:
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[A]: The fourteenth season finale

[Q]: Question: "Which came first, the Second Vatican Council, or the year 1917?" Context: "The first Code of Canon Law, 1917, was mostly for the Roman Rite, with limited application to the Eastern Churches. After the Second Vatican Council, (1962 - 1965), another edition was published specifically for the Roman Rite in 1983. Most recently, 1990, the Vatican produced the Code of Canons of the Eastern Churches which became the 1st code of Eastern Catholic Canon Law." Answer:
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[A]:
1917