Input: Frederic Chopin
The 21 nocturnes are more structured, and of greater emotional depth, than those of Field (whom Chopin met in 1833). Many of the Chopin nocturnes have middle sections marked by agitated expression (and often making very difficult demands on the performer) which heightens their dramatic character.

How many nocturnes did Chopin compose?
Output: 21

Input: Article: Western political philosophy originates in the philosophy of ancient Greece, where political philosophy dates back to at least Plato. Ancient Greece was dominated by city-states, which experimented with various forms of political organization, grouped by Plato into four categories: timocracy, tyranny, democracy and oligarchy. One of the first, extremely important classical works of political philosophy is Plato's Republic, which was followed by Aristotle's Nichomachean Ethics and Politics. Roman political philosophy was influenced by the Stoics, including the Roman statesman Cicero.

Now answer this question: What philosophy has dates back to at least Plato?

Output: philosophy of ancient Greece

Article: Although Calvin and Huldrych Zwingli honored Mary as the Mother of God in the 16th century, they did so less than Martin Luther. Thus the idea of respect and high honor for Mary was not rejected by the first Protestants; but, they came to criticize the Roman Catholics for venerating Mary. Following the Council of Trent in the 16th century, as Marian veneration became associated with Catholics, Protestant interest in Mary decreased. During the Age of the Enlightenment any residual interest in Mary within Protestant churches almost disappeared, although Anglicans and Lutherans continued to honor her.

Question: During which historical era did Protestant interest in Mary almost disappear?
Ans: Age of the Enlightenment

Here is a question about this article: Rex Stout's fictional detective Nero Wolfe is described as fond of solving the London Times' crossword puzzle at his New York home, in preference to those of American papers.
What is the answer to this question: The fictional detective, Nero Wolfe, is described as fond of solving what kind of puzzle in the London Times newspaper?
****
So... crossword

The problem: Answer a question about this article:
Education remained mostly focused on the training of future clergy. The basic learning of the letters and numbers remained the province of the family or a village priest, but the secondary subjects of the triviumgrammar, rhetoric, logicwere studied in cathedral schools or in schools provided by cities. Commercial secondary schools spread, and some Italian towns had more than one such enterprise. Universities also spread throughout Europe in the 14th and 15th centuries. Lay literacy rates rose, but were still low; one estimate gave a literacy rate of ten per cent of males and one per cent of females in 1500.
In 1500, approximately what percent of European women could read?
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The answer: one

The problem: Answer a question about this article:
Although coal, hydrocarbons, iron ore, platinum, copper, chromium, nickel, gold and other minerals have been found, they have not been in large enough quantities to exploit. The 1991 Protocol on Environmental Protection to the Antarctic Treaty also restricts a struggle for resources. In 1998, a compromise agreement was reached to place an indefinite ban on mining, to be reviewed in 2048, further limiting economic development and exploitation. The primary economic activity is the capture and offshore trading of fish. Antarctic fisheries in 200001 reported landing 112,934 tonnes.
In what year was an agreement reached to ban mining in Antarctica?
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The answer:
1998