This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[EX Q]: Passage: Yet another boom began as the city emerged from the Great Recession. Amazon.com moved its headquarters from North Beacon Hill to South Lake Union and began a rapid expansion. For the five years beginning in 2010, Seattle gained an average of 14,511 residents per year, with the growth strongly skewed toward the center of the city, as unemployment dropped from roughly 9 percent to 3.6 percent. The city has found itself "bursting at the seams," with over 45,000 households spending more than half their income on housing and at least 2,800 people homeless, and with the country's sixth-worst rush hour traffic. Question: When did Amazon begin its latest expansion?
[EX A]: 2010

[EX Q]: Passage: 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. Question: Western political philosophy originates in what philosophy?
[EX A]: ancient Greece

[EX Q]: Passage: Evidence suggests that blast furnaces, that convert raw iron ore into pig iron, which can be remelted in a cupola furnace to produce cast iron by means of a cold blast and hot blast, were operational in China by the late Spring and Autumn period (722481 BC). The bloomery was nonexistent in ancient China; however, the Han-era Chinese produced wrought iron by injecting excess oxygen into a furnace and causing decarburization. Cast iron and pig iron could be converted into wrought iron and steel using a fining process. Question: What type of process was used to convert various metals into steel?
[EX A]:
fining