Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Over the course of adolescence, the amount of white matter in the brain increases linearly, while the amount of grey matter in the brain follows an inverted-U pattern. Through a process called synaptic pruning, unnecessary neuronal connections in the brain are eliminated and the amount of grey matter is pared down. However, this does not mean that the brain loses functionality; rather, it becomes more efficient due to increased myelination (insulation of axons) and the reduction of unused pathways.
Does the brain become more or less efficient as a result of synaptic pruning?
A: more efficient

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The best-known medieval Chinese name for Tibet is Tubo (Chinese: also written as or ; pinyin: Tubo or Tufan). This name first appears in Chinese characters as in the 7th century (Li Tai) and as in the 10th-century (Old Book of Tang describing 608609 emissaries from Tibetan King Namri Songtsen to Emperor Yang of Sui). In the Middle Chinese spoken during that period, as reconstructed by William H. Baxter, was pronounced thux-phjon and was pronounced thux-pjon (with the x representing tone).
What is the best known Chinese name for Tubo?
A: unanswerable

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At the time of the fall of the Egyptian monarchy in the early 1950s, less than half a million Egyptians were considered upper class and rich, four million middle class and 17 million lower class and poor. Fewer than half of all primary-school-age children attended school, most of them being boys. Nasser's policies changed this. Land reform and distribution, the dramatic growth in university education, and government support to national industries greatly improved social mobility and flattened the social curve. From academic year 1953-54 through 1965-66, overall public school enrolments more than doubled. Millions of previously poor Egyptians, through education and jobs in the public sector, joined the middle class. Doctors, engineers, teachers, lawyers, journalists, constituted the bulk of the swelling middle class in Egypt under Nasser. During the 1960s, the Egyptian economy went from sluggish to the verge of collapse, the society became less free, and Nasser's appeal waned considerably.
How many middle class were in Egypt in 1950s
A: four million

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Advanced economies led global economic growth prior to the financial crisis with "emerging" and "developing" economies lagging behind. The crisis completely overturned this relationship. The International Monetary Fund found that "advanced" economies accounted for only 31% of global GDP while emerging and developing economies accounted for 69% of global GDP from 2007 to 2014. In the tables, the names of emergent economies are shown in boldface type, while the names of developed economies are in Roman (regular) type.
What economies led global economic growth prior to the financial crisis?
A:
Advanced economies