Problem: Given the question: Extract the answer to the question from the following context. Question: What is a benefit of those elevators with unique designs? Context: A residential elevator is often permitted to be of lower cost and complexity than full commercial elevators. They may have unique design characteristics suited for home furnishings, such as hinged wooden shaft-access doors rather than the typical metal sliding doors of commercial elevators. Construction may be less robust than in commercial designs with shorter maintenance periods, but safety systems such as locks on shaft access doors, fall arrestors, and emergency phones must still be present in the event of malfunction.
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The answer is:
lower cost and complexity

input question: Extract the answer to the question from the following context. Question: Who was younger in 1985, Chernenko or Gorbachev? Context: Mikhail Gorbachev was elected General Secretary by the Politburo on March 11, 1985, three hours after predecessor Konstantin Chernenko's death at age 73. Gorbachev, aged 54, was the youngest member of the Politburo. His initial goal as general secretary was to revive the Soviet economy, and he realized that doing so would require reforming underlying political and social structures. The reforms began with personnel changes of senior Brezhnev-era officials who would impede political and economic change. On April 23, 1985, Gorbachev brought two proteges, Yegor Ligachev and Nikolai Ryzhkov, into the Politburo as full members. He kept the "power" ministries happy by promoting KGB Head Viktor Chebrikov from candidate to full member and appointing Minister of Defence Marshal Sergei Sokolov as a Politburo candidate.???
output answer: Gorbachev

Extract the answer to the question from the following context. Question: What conflict did Britain encounter in Africa? Context: In Britain's "imperial century", victory over Napoleon left Britain without any serious international rival, other than Russia in central Asia. Unchallenged at sea, Britain adopted the role of global policeman, a state of affairs later known as the Pax Britannica, and a foreign policy of "splendid isolation". Alongside the formal control it exerted over its own colonies, Britain's dominant position in world trade meant that it effectively controlled the economies of many nominally independent countries, such as China, Argentina and Siam, which has been generally characterized as "informal empire". Of note during this time was the Anglo-Zulu War, which was fought in 1879 between the British Empire and the Zulu Empire.
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Answer: Anglo-Zulu War

Q: Extract the answer to the question from the following context. Question: Who found that there were issues with the efforts of the foundation? Context: The foundation has donated billions of dollars to help sufferers of AIDS, tuberculosis and malaria, protecting millions of children from death at the hands of preventable diseases. However, a 2007 investigation by The Los Angeles Times claimed there are three major unintended consequences with the foundation's allocation of aid. First, sub-Saharan Africa already suffered from a shortage of primary doctors before the arrival of the Gates Foundation, but "by pouring most contributions into the fight against such high-profile killers as AIDS, Gates grantees have increased the demand for specially trained, higher-paid clinicians, diverting staff from basic care" in sub-Saharan Africa. This "brain drain" adds to the existing doctor shortage and pulls away additional trained staff from children and those suffering from other common killers. Second, "the focus on a few diseases has shortchanged basic needs such as nutrition and transportation". Third, "Gates-funded vaccination programs have instructed caregivers to ignore even discourage patients from discussing ailments that the vaccinations cannot prevent".
A: The Los Angeles Times

Question: Extract the answer to the question from the following context. Question: What does the water beneath the city do? Context: Beneath the plain lies the Biscayne Aquifer, a natural underground source of fresh water that extends from southern Palm Beach County to Florida Bay, with its highest point peaking around the cities of Miami Springs and Hialeah. Most of the Miami metropolitan area obtains its drinking water from this aquifer. As a result of the aquifer, it is not possible to dig more than 15 to 20 ft (5 to 6 m) beneath the city without hitting water, which impedes underground construction, though some underground parking garages exist. For this reason, the mass transit systems in and around Miami are elevated or at-grade.[citation needed]
Answer: impedes underground construction

Please answer this: Extract the answer to the question from the following context. Question: What doesn;t a player need to touch a disc? Context: LaserDiscs potentially had a much longer lifespan than videocassettes. Because the discs were read optically instead of magnetically, no physical contact needs to be made between the player and the disc, except for the player's clamp that holds the disc at its center as it is spun and read. As a result, playback would not wear the information-bearing part of the discs, and properly manufactured LDs would theoretically last beyond one's lifetime. By contrast, a VHS tape held all of its picture and sound information on the tape in a magnetic coating which is in contact with the spinning heads on the head drum, causing progressive wear with each use (though later in VHS's lifespan, engineering improvements allowed tapes to be made and played back without contact). Also, the tape was thin and delicate, and it was easy for a player mechanism, especially on a low quality or malfunctioning model, to mishandle the tape and damage it by creasing it, frilling (stretching) its edges, or even breaking it.
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Answer:
the discs were read optically instead of magnetically