Problem: Liberia:

Liberia has a long, rich history in textile arts and quilting, as the settlers brought with them their sewing and quilting skills. Liberia hosted National Fairs in 1857 and 1858 in which prizes were awarded for various needle arts. One of the most well-known Liberian quilters was Martha Ann Ricks, who presented a quilt featuring the famed Liberian coffee tree to Queen Victoria in 1892. When President Ellen Johnson Sirleaf moved into the Executive Mansion, she reportedly had a Liberian-made quilt installed in her presidential office.

What kind of tree did Ellen Johnson Sirleaf own?
---
A: unanswerable

Problem: Thermal mass systems can store solar energy in the form of heat at domestically useful temperatures for daily or interseasonal durations. Thermal storage systems generally use readily available materials with high specific heat capacities such as water, earth and stone. Well-designed systems can lower peak demand, shift time-of-use to off-peak hours and reduce overall heating and cooling requirements.
What is the system called that can store solar energy in the form of heat?
---
Answer: Thermal mass systems

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Arsenal's tally of 13 League Championships is the third highest in English football, after Manchester United (20) and Liverpool (18), and they were the first club to reach 8 League Championships. They hold the highest number of FA Cup trophies, 12. The club is one of only six clubs to have won the FA Cup twice in succession, in 2002 and 2003, and 2014 and 2015. Arsenal have achieved three League and FA Cup "Doubles" (in 1971, 1998 and 2002), a feat only previously achieved by Manchester United (in 1994, 1996 and 1999). They were the first side in English football to complete the FA Cup and League Cup double, in 1993. Arsenal were also the first London club to reach the final of the UEFA Champions League, in 2006, losing the final 21 to Barcelona.
Which team has the second most FA Cup trophies?
A: unanswerable

Context and question: Asthma as a result of (or worsened by) workplace exposures, is a commonly reported occupational disease. Many cases however are not reported or recognized as such. It is estimated that 525% of asthma cases in adults are workrelated. A few hundred different agents have been implicated with the most common being: isocyanates, grain and wood dust, colophony, soldering flux, latex, animals, and aldehydes. The employment associated with the highest risk of problems include: those who spray paint, bakers and those who process food, nurses, chemical workers, those who work with animals, welders, hairdressers and timber workers.
What are two agents that are commonly believed to cause colophony?
Answer: unanswerable

Question: To qualify for participation in the auctions, banks must be able to offer proof of appropriate collateral in the form of loans to other entities. These can be the public debt of member states, but a fairly wide range of private banking securities are also accepted. The fairly stringent membership requirements for the European Union, especially with regard to sovereign debt as a percentage of each member state's gross domestic product, are designed to insure that assets offered to the bank as collateral are, at least in theory, all equally good, and all equally protected from the risk of inflation.
Is there an answer to this question: What should all assets offered up as collateral be?

Answer: all equally good, and all equally protected from the risk of inflation

Problem: Elizabeth II:

Elizabeth's personal fortune has been the subject of speculation for many years. Jock Colville, who was her former private secretary and a director of her bank, Coutts, estimated her wealth in 1971 at 2 million (equivalent to about 25 million today). In 1993, Buckingham Palace called estimates of 100 million "grossly overstated". She inherited an estimated 70 million estate from her mother in 2002. The Sunday Times Rich List 2015 estimated her private wealth at 340 million, making her the 302nd richest person in the UK.

In what year did Jock Colville leave Elizabeth's service?
---
A:
unanswerable