instruction:
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
question:
The crisis deepened during the 17th century with the expulsion in 1609 of the Jews and the Moriscos, descendants of the Muslim population that converted to Christianity under threat of exile from Ferdinand and Isabella in 1502. From 1609 through 1614, the Spanish government systematically forced Moriscos to leave the kingdom for Muslim North Africa. They were concentrated in the former Kingdom of Aragon, where they constituted a fifth of the population, and the Valencia area specifically, where they were roughly a third of the total population. The expulsion caused the financial ruin of some of the nobility and the bankruptcy of the Taula de Canvi in 1613. The Crown endeavoured to compensate the nobles, who had lost much of their agricultural labour force; this harmed the economy of the city for generations to come. Later, during the so-called Catalan Revolt (16401652), Valencia contributed to the cause of Philip IV with militias and money, resulting in a period of further economic hardship exacerbated by the arrival of troops from other parts of Spain.
answer:
What people group was descended from Muslim converts to Christianity?

question:
As early as 1934, Popper wrote of the search for truth as "one of the strongest motives for scientific discovery." Still, he describes in Objective Knowledge (1972) early concerns about the much-criticised notion of truth as correspondence. Then came the semantic theory of truth formulated by the logician Alfred Tarski and published in 1933. Popper writes of learning in 1935 of the consequences of Tarski's theory, to his intense joy. The theory met critical objections to truth as correspondence and thereby rehabilitated it. The theory also seemed, in Popper's eyes, to support metaphysical realism and the regulative idea of a search for truth.
answer:
Whose theory of truth did Popper read with intense interest in 1935?

question:
Due to the tree structure of the filter bank, pre-echo problems are made worse, as the combined impulse response of the two filter banks does not, and cannot, provide an optimum solution in time/frequency resolution. Additionally, the combining of the two filter banks' outputs creates aliasing problems that must be handled partially by the "aliasing compensation" stage; however, that creates excess energy to be coded in the frequency domain, thereby decreasing coding efficiency.[citation needed]
answer:
What kind of structure does a filter bank have?