Input: Ministry of Defence (United Kingdom)
Henry VIII's wine cellar at the Palace of Whitehall, built in 15141516 for Cardinal Wolsey, is in the basement of Main Building, and is used for entertainment. The entire vaulted brick structure of the cellar was encased in steel and concrete and relocated nine feet to the west and nearly 19 feet (5.8 m) deeper in 1949, when construction was resumed at the site after World War II. This was carried out without any significant damage to the structure.

Who had a wine cellar at the Palace of Whitehall?
Output: Henry VIII

Input: Article: In 1790, the first federal population census was taken in the United States. Enumerators were instructed to classify free residents as white or "other." Only the heads of households were identified by name in the federal census until 1850. Native Americans were included among "Other;" in later censuses, they were included as "Free people of color" if they were not living on Indian reservations. Slaves were counted separately from free persons in all the censuses until the Civil War and end of slavery. In later censuses, people of African descent were classified by appearance as mulatto (which recognized visible European ancestry in addition to African) or black.

Now answer this question: when did any changes to counting procedures happen?

Output: until the Civil War and end of slavery.

Article: In 1775, Patrick Henry delivered his famous "Give me Liberty or Give me Death" speech in St. John's Church in Richmond, crucial for deciding Virginia's participation in the First Continental Congress and setting the course for revolution and independence. On April 18, 1780, the state capital was moved from the colonial capital of Williamsburg to Richmond, to provide a more centralized location for Virginia's increasing westerly population, as well as to isolate the capital from British attack. The latter motive proved to be in vain, and in 1781, under the command of Benedict Arnold, Richmond was burned by British troops, causing Governor Thomas Jefferson to flee as the Virginia militia, led by Sampson Mathews, defended the city.

Question: What happened on April 18, 1780?
Ans: the state capital was moved from the colonial capital of Williamsburg to Richmond

Here is a question about this article: The most common symptom of LED (and diode laser) failure is the gradual lowering of light output and loss of efficiency. Sudden failures, although rare, can also occur. Early red LEDs were notable for their short service life. With the development of high-power LEDs the devices are subjected to higher junction temperatures and higher current densities than traditional devices. This causes stress on the material and may cause early light-output degradation. To quantitatively classify useful lifetime in a standardized manner it has been suggested to use L70 or L50, which are the runtimes (typically given in thousands of hours) at which a given LED reaches 70% and 50% of initial light output, respectively.
What is the answer to this question: What is a symptom of LED failure?
****
So... loss of efficiency

The problem: Answer a question about this article:
In simple terms, the Cold War could be viewed as an expression of the ideological struggle between communism and capitalism. The United States faced a new uncertainty beginning in September 1949, when it lost its monopoly on the atomic bomb. American intelligence agencies discovered that the Soviet Union had exploded its first atomic bomb, with the consequence that the United States potentially could face a future nuclear war that, for the first time, might devastate its cities. Given this new danger, the United States participated in an arms race with the Soviet Union that included development of the hydrogen bomb, as well as intercontinental strategic bombers and intercontinental ballistic missiles (ICBMs) capable of delivering nuclear weapons. A new fear of communism and its sympathizers swept the United States during the 1950s, which devolved into paranoid McCarthyism. With communism spreading in China, Korea, and Eastern Europe, Americans came to feel so threatened that popular and political culture condoned extensive "witch-hunts" to expose communist spies. Part of the American reaction to the Soviet atomic and hydrogen bomb tests included maintaining a large Air Force, under the control of the Strategic Air Command (SAC). SAC employed intercontinental strategic bombers, as well as medium-bombers based close to Soviet airspace (in western Europe and in Turkey) that were capable of delivering nuclear payloads.
What year did the US lose its monopoly to the atomic bomb?
****
The answer: 1949

The problem: Answer a question about this article:
Local anesthetic injections into the nerves or sensitive areas of the stump may relieve pain for days, weeks, or sometimes permanently, despite the drug wearing off in a matter of hours; and small injections of hypertonic saline into the soft tissue between vertebrae produces local pain that radiates into the phantom limb for ten minutes or so and may be followed by hours, weeks or even longer of partial or total relief from phantom pain. Vigorous vibration or electrical stimulation of the stump, or current from electrodes surgically implanted onto the spinal cord, all produce relief in some patients.
How long can an anesthetic, at max, relieve pain for, despite wearing off in only hours?
****
The answer:
permanently