Problem: Han dynasty:

Though Han wooden structures decayed, some Han-dynasty ruins made of brick, stone, and rammed earth remain intact. This includes stone pillar-gates, brick tomb chambers, rammed-earth city walls, rammed-earth and brick beacon towers, rammed-earth sections of the Great Wall, rammed-earth platforms where elevated halls once stood, and two rammed-earth castles in Gansu. The ruins of rammed-earth walls that once surrounded the capitals Chang'an and Luoyang still stand, along with their drainage systems of brick arches, ditches, and ceramic water pipes. Monumental stone pillar-gates, twenty-nine of which survive from the Han period, formed entrances of walled enclosures at shrine and tomb sites. These pillars feature artistic imitations of wooden and ceramic building components such as roof tiles, eaves, and balustrades.

What architectural feature contained an imitation of a balustrade?
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A: stone pillar-gates

Problem: Many crops first domesticated by indigenous Americans are now produced and used globally. Chief among these is maize or "corn", arguably the most important crop in the world. Other significant crops include cassava, chia, squash (pumpkins, zucchini, marrow, acorn squash, butternut squash), the pinto bean, Phaseolus beans including most common beans, tepary beans and lima beans, tomatoes, potatoes, avocados, peanuts, cocoa beans (used to make chocolate), vanilla, strawberries, pineapples, Peppers (species and varieties of Capsicum, including bell peppers, jalapenos, paprika and chili peppers) sunflower seeds, rubber, brazilwood, chicle, tobacco, coca, manioc and some species of cotton.
What type of bean is used to make chocolate?
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Answer: cocoa

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Commercial CSP plants were first developed in the 1980s. Since 1985 the eventually 354 MW SEGS CSP installation, in the Mojave Desert of California, is the largest solar power plant in the world. Other large CSP plants include the 150 MW Solnova Solar Power Station and the 100 MW Andasol solar power station, both in Spain. The 250 MW Agua Caliente Solar Project, in the United States, and the 221 MW Charanka Solar Park in India, are the world's largest photovoltaic plants. Solar projects exceeding 1 GW are being developed, but most of the deployed photovoltaics are in small rooftop arrays of less than 5 kW, which are grid connected using net metering and/or a feed-in tariff. In 2013 solar generated less than 1% of the worlds total grid electricity.
What is the largest solar power plant in the world?
A: 354 MW SEGS CSP

Context and question: Voiceless consonants are produced with the vocal folds open (spread) and not vibrating, and voiced consonants are produced when the vocal folds are fractionally closed and vibrating (modal voice). Voiceless aspiration occurs when the vocal cords remain open after a consonant is released. An easy way to measure this is by noting the consonant's voice-onset time, as the voicing of a following vowel cannot begin until the vocal cords close.
Voiced consonants are produced when what opens?
Answer: unanswerable

Question: On 14 July, Iraqi army officers Abdel Karim Qasim and Abdel Salam Aref overthrew the Iraqi monarchy and, the next day, Iraqi prime minister and Nasser's chief Arab antagonist, Nuri al-Said, was killed. Nasser recognized the new government and stated that "any attack on Iraq was tantamount to an attack on the UAR". On 15 July, US marines landed in Lebanon, and British special forces in Jordan, upon the request of those countries' governments to prevent them from falling to pro-Nasser forces. Nasser felt that the revolution in Iraq left the road for pan-Arab unity unblocked. On 19 July, for the first time, he declared that he was opting for full Arab union, although he had no plan to merge Iraq with the UAR. While most members of the Iraqi Revolutionary Command Council (RCC) favored Iraqi-UAR unity, Qasim sought to keep Iraq independent and resented Nasser's large popular base in the country.
Is there an answer to this question: What anti-Nasser Iraqi was assassinated?

Answer: Nuri al-Said

Question: Conversely, YouTube has also allowed government to more easily engage with citizens, the White House's official YouTube channel being the seventh top news organization producer on YouTube in 2012 and in 2013 a healthcare exchange commissioned Obama impersonator Iman Crosson's YouTube music video spoof to encourage young Americans to enroll in the Affordable Care Act (Obamacare)-compliant health insurance. In February 2014, U.S. President Obama held a meeting at the White House with leading YouTube content creators to not only promote awareness of Obamacare but more generally to develop ways for government to better connect with the "YouTube Generation". Whereas YouTube's inherent ability to allow presidents to directly connect with average citizens was noted, the YouTube content creators' new media savvy was perceived necessary to better cope with the website's distracting content and fickle audience.
Is there an answer to this question: What was deemed necessary by the white house when creating youtube content?

Answer:
creators' new media savvy