Problem: Alexander Graham Bell:

Bell is also credited with developing one of the early versions of a metal detector in 1881. The device was quickly put together in an attempt to find the bullet in the body of U.S. President James Garfield. According to some accounts, the metal detector worked flawlessly in tests but did not find the assassin's bullet partly because the metal bed frame on which the President was lying disturbed the instrument, resulting in static. The president's surgeons, who were skeptical of the device, ignored Bell's requests to move the president to a bed not fitted with metal springs. Alternatively, although Bell had detected a slight sound on his first test, the bullet may have been lodged too deeply to be detected by the crude apparatus.

What did Bell think was wrong with the bed, which prevented his machine from finding the bullet?
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A: metal bed frame

Problem: The Central African Republic (CAR; Sango: Kodorosese ti Beafrika; French: Republique centrafricaine pronounced: [epyblik stafikn], or Centrafrique [stafik]) is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the east, the Democratic Republic of the Congo and the Republic of the Congo to the south and Cameroon to the west. The CAR covers a land area of about 620,000 square kilometres (240,000 sq mi) and had an estimated population of around 4.7 million as of 2014[update].
Where is the Central African Republic located?
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Answer: Central Africa

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Marshal MacMahon, now closest to Wissembourg, spread his four divisions over 20 miles (32 km) to react to any Prussian invasion. This organization of forces was due to a lack of supplies, forcing each division to seek out basic provisions along with the representatives of the army supply arm that was supposed to aid them. What made a bad situation much worse was the conduct of General Auguste-Alexandre Ducrot, commander of the 1st Division. He told General Abel Douay, commander of the 2nd Division, on 1 August that "The information I have received makes me suppose that the enemy has no considerable forces very near his advance posts, and has no desire to take the offensive". Two days later, he told MacMahon that he had not found "a single enemy post ... it looks to me as if the menace of the Bavarians is simply bluff". Even though Ducrot shrugged off the possibility of an attack by the Germans, MacMahon tried to warn the other divisions of his army, without success.
Whose conduct made a bad situation worse?
A: General Auguste-Alexandre Ducrot

Context and question: By the late Middle Ages university towns had grown in wealth and importance as well, and this was reflected in the buildings of some of Europe's ancient universities. Particularly remarkable examples still standing nowadays include the Collegio di Spagna in the University of Bologna, built during the 14th and 15th centuries; the Collegium Carolinum of the University of Prague in Bohemia; the Escuelas mayores of the University of Salamanca in Spain; the chapel of King's College, Cambridge; or the Collegium Maius of the Jagiellonian University in Krakow, Poland.
What is the name of the building at University of Prague in Bohemia?
Answer: the Collegium Carolinum

Question: These immigrants were largely responsible for the first general strike in North America in 1835, in which workers in the city won the ten-hour workday. The city was a destination for thousands of Irish immigrants fleeing the Great Famine in the 1840s; housing for them was developed south of South Street, and was later occupied by succeeding immigrants. They established a network of Catholic churches and schools, and dominated the Catholic clergy for decades. Anti-Irish, anti-Catholic Nativist riots had erupted in Philadelphia in 1844. In the latter half of the century, immigrants from Russia, Eastern Europe and Italy; and African Americans from the southern U.S. settled in the city. Between 1880 and 1930, the African-American population of Philadelphia increased from 31,699 to 219,559. Twentieth-century black newcomers were part of the Great Migration out of the rural South to northern and midwestern industrial cities.
Is there an answer to this question: Who carried out the first strike in North America?

Answer: immigrants

Question: The Somerset Coal Canal was built in the early 19th century to reduce the cost of transportation of coal and other heavy produce. The first 16 kilometres (10 mi), running from a junction with the Kennet and Avon Canal, along the Cam valley, to a terminal basin at Paulton, were in use by 1805, together with several tramways. A planned 11.7 km (7.3 mi) branch to Midford was never built, but in 1815 a tramway was laid along its towing path. In 1871 the tramway was purchased by the Somerset and Dorset Joint Railway (S&DJR), and operated until the 1950s.
Is there an answer to this question: What was never built

Answer:
A planned 11.7 km (7.3 mi) branch to Midford was never built