Problem: New York City:

Real estate is a major force in the city's economy, as the total value of all New York City property was assessed at US$914.8 billion for the 2015 fiscal year. The Time Warner Center is the property with the highest-listed market value in the city, at US$1.1 billion in 2006. New York City is home to some of the nation'sand the world'smost valuable real estate. 450 Park Avenue was sold on July 2, 2007 for US$510 million, about $1,589 per square foot ($17,104/m), breaking the barely month-old record for an American office building of $1,476 per square foot ($15,887/m) set in the June 2007 sale of 660 Madison Avenue. According to Forbes, in 2014, Manhattan was home to six of the top ten zip codes in the United States by median housing price.

What was the price per square foot of 450 Park Avenue when it sold in July 2007?
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A: $1,589

Problem: An alloy of aluminium and gallium in pellet form added to water can be used to generate hydrogen. The process also produces alumina, but the expensive gallium, which prevents the formation of an oxide skin on the pellets, can be re-used. This has important potential implications for a hydrogen economy, as hydrogen can be produced on-site and does not need to be transported.
When you combine an alloy of alluminum and gallium to water, what do you get?
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Answer: hydrogen

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
He was General Secretary (later Chairman of the Presidium) of the League of Communists of Yugoslavia (193980), and went on to lead the World War II Yugoslav guerrilla movement, the Partisans (194145). After the war, he was the Prime Minister (194463), President (later President for Life) (195380) of the Socialist Federal Republic of Yugoslavia (SFRY). From 1943 to his death in 1980, he held the rank of Marshal of Yugoslavia, serving as the supreme commander of the Yugoslav military, the Yugoslav People's Army (JNA). With a highly favourable reputation abroad in both Cold War blocs, Josip Broz Tito received some 98 foreign decorations, including the Legion of Honour and the Order of the Bath.
During what years did Tito lead the Partisans?
A: 194145

Context and question: The religion's failure to report abuse allegations to authorities has also been criticized. The Watch Tower Society's policy is that elders inform authorities when required by law to do so, but otherwise leave that action up to the victim and his or her family. The Australian Royal Commission into Institutional Responses to Child Sexual Abuse found that of 1006 alleged perpetrators of child sexual abuse identified by the Jehovah's Witnesses within their organization since 1950, "not one was reported by the church to secular authorities." William Bowen, a former Jehovah's Witness elder who established the Silentlambs organization to assist sex abuse victims within the religion, has claimed Witness leaders discourage followers from reporting incidents of sexual misconduct to authorities, and other critics claim the organization is reluctant to alert authorities in order to protect its "crime-free" reputation. In court cases in the United Kingdom and the United States the Watch Tower Society has been found to have been negligent in its failure to protect children from known sex offenders within the congregation and the Society has settled other child abuse lawsuits out of court, reportedly paying as much as $780,000 to one plaintiff without admitting wrongdoing.
How much has the Society reportedly paid to settle lawsuits without admitting any wrongdoing?
Answer: as much as $780,000 to one plaintiff

Question: The basic annelid form consists of multiple segments. Each segment has the same sets of organs and, in most polychaetes, has a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly defined or absent in others, and Echiura and Sipuncula show no obvious signs of segmentation. In species with well-developed septa, the blood circulates entirely within blood vessels, and the vessels in segments near the front ends of these species are often built up with muscles that act as hearts. The septa of such species also enable them to change the shapes of individual segments, which facilitates movement by peristalsis ("ripples" that pass along the body) or by undulations that improve the effectiveness of the parapodia. In species with incomplete septa or none, the blood circulates through the main body cavity without any kind of pump, and there is a wide range of locomotory techniques some burrowing species turn their pharynges inside out to drag themselves through the sediment.
Is there an answer to this question: What is movement by ripples no longer called?

Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During the Three Kingdoms period of ancient China, there was constant warfare occurring in the Central Plain of China. Northerners began to enter into Fujian region, causing the region to incorporate parts of northern Chinese dialects. However, the massive migration of northern Han Chinese into Fujian region mainly occurred after the Disaster of Yongjia. The Jin court fled from the north to the south, causing large numbers of northern Han Chinese to move into Fujian region. They brought the old Chinese spoken in Central Plain of China from prehistoric era to 3rd century into Fujian. This then gradually evolved into the Quanzhou dialect.
What court fled from the south to the north during the three Kings period?
A:
unanswerable