[Q]: Extract the answer to the question from the following context. Question: DC is less hazardous than AC because it generates less? Context: There has, however, been interest among railroad operators in returning to DC use at higher voltages than previously used. At the same voltage, DC often has less loss than AC, and for this reason high-voltage direct current is already used on some bulk power transmission lines. DC avoids the electromagnetic radiation inherent with AC, and on a railway this also reduces interference with signalling and communications and mitigates hypothetical EMF risks. DC also avoids the power factor problems of AC. Of particular interest to railroading is that DC can supply constant power with a single ungrounded wire. Constant power with AC requires three-phase transmission with at least two ungrounded wires. Another important consideration is that mains-frequency 3-phase AC must be carefully planned to avoid unbalanced phase loads. Parts of the system are supplied from different phases on the assumption that the total loads of the 3 phases will even out. At the phase break points between regions supplied from different phases, long insulated supply breaks are required to avoid them being shorted by rolling stock using more than one pantograph at a time. A few railroads have tried 3-phase but its substantial complexity has made single-phase standard practice despite the interruption in power flow that occurs twice every cycle. An experimental 6 kV DC railway was built in the Soviet Union.
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[A]: electromagnetic radiation

[Q]: Extract the answer to the question from the following context. Question: What was the main cause of floods to the city of Hyderabad until an artificial reservoir was built? Context: Hyderabad (i/hadrbd/ HY-dr--bad; often /hadrbd/) is the capital of the southern Indian state of Telangana and de jure capital of Andhra Pradesh.[A] Occupying 650 square kilometres (250 sq mi) along the banks of the Musi River, it has a population of about 6.7 million and a metropolitan population of about 7.75 million, making it the fourth most populous city and sixth most populous urban agglomeration in India. At an average altitude of 542 metres (1,778 ft), much of Hyderabad is situated on hilly terrain around artificial lakes, including Hussain Sagarpredating the city's foundingnorth of the city centre.
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[A]: Musi River

[Q]: Extract the answer to the question from the following context. Question: 3D representations of a proposed structure, typically on a smaller scale than the original are called? Context: Disagreements over the island's relationship with Australia were put in sharper relief by a 2006 review undertaken by the Australian government. Under the more radical of two models proposed in the review, the island's legislative assembly would have been reduced to the status of a local council. However, in December 2006, citing the "significant disruption" that changes to the governance would impose on the island's economy, the Australian government ended the review leaving the existing governance arrangements unaltered.
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[A]: models

[Q]: Extract the answer to the question from the following context. Question: What did the President do when the Pope passed away? Context: On 3 December 1963, US President Lyndon B. Johnson posthumously awarded him the Presidential Medal of Freedom, the United States' highest civilian award, in recognition of the good relationship between Pope John XXIII and the United States of America. In his speech on 6 December 1963, Johnson said: "I have also determined to confer the Presidential Medal of Freedom posthumously on another noble man whose death we mourned 6 months ago: His Holiness, Pope John XXIII. He was a man of simple origins, of simple faith, of simple charity. In this exalted office he was still the gentle pastor. He believed in discussion and persuasion. He profoundly respected the dignity of man. He gave the world immortal statements of the rights of man, of the obligations of men to each other, of their duty to strive for a world community in which all can live in peace and fraternal friendship. His goodness reached across temporal boundaries to warm the hearts of men of all nations and of all faiths".
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[A]:
mourned