Problem: Brigham Young University:

BYU mandates that its students who are members of the LDS Church be religiously active. Both LDS and Non-LDS students are required to provide an endorsement from an ecclesiastic leader with their application for admittance. Over 900 rooms on BYU campus are used for the purposes of LDS Church congregations. More than 150 congregations meet on BYU campus each Sunday. "BYU's campus becomes one of the busiest and largest centers of worship in the world" with about 24,000 persons attending church services on campus.

What are 150 rooms on campus used for?
---
A: unanswerable

Problem: Aristotle wrote in his book Meteorology about an Antarctic region in c. 350 B.C. Marinus of Tyre reportedly used the name in his unpreserved world map from the 2nd century A.D. The Roman authors Hyginus and Apuleius (12 centuries A.D.) used for the South Pole the romanized Greek name polus antarcticus, from which derived the Old French pole antartike (modern pole antarctique) attested in 1270, and from there the Middle English pol antartik in a 1391 technical treatise by Geoffrey Chaucer (modern Antarctic Pole).
Who used Meteorology in his preserved world map?
---
Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
When a tree is very young it is covered with limbs almost, if not entirely, to the ground, but as it grows older some or all of them will eventually die and are either broken off or fall off. Subsequent growth of wood may completely conceal the stubs which will however remain as knots. No matter how smooth and clear a log is on the outside, it is more or less knotty near the middle. Consequently, the sapwood of an old tree, and particularly of a forest-grown tree, will be freer from knots than the inner heartwood. Since in most uses of wood, knots are defects that weaken the timber and interfere with its ease of working and other properties, it follows that a given piece of sapwood, because of its position in the tree, may well be stronger than a piece of heartwood from the same tree.
What hides the stubs of a tree's lost limbs from being visible later in its life?
A: Subsequent growth

Context and question: The Republic of the Congo received full independence from France on August 15, 1960. Fulbert Youlou ruled as the country's first president until labour elements and rival political parties instigated a three-day uprising that ousted him. The Congolese military took charge of the country briefly and installed a civilian provisional government headed by Alphonse Massamba-Debat.
When did the Congo lose independence from colonial rule?
Answer: unanswerable

Question: Since the 19th century, the built-up area of Paris has grown far beyond its administrative borders; together with its suburbs, the whole agglomeration has a population of 10,550,350 (Jan. 2012 census). Paris' metropolitan area spans most of the Paris region and has a population of 12,341,418 (Jan. 2012 census), or one-fifth of the population of France. The administrative region covers 12,012 km (4,638 mi), with approximately 12 million inhabitants as of 2014, and has its own regional council and president.
Is there an answer to this question: What is the aggregate population of Paris?

Answer: 10,550,350

Armenia is member of Collective Security Treaty Organisation (CSTO) along with Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan and Uzbekistan. It participates in NATO's Partnership for Peace (PiP) program and is in a NATO organisation called Euro-Atlantic Partnership Council (EAPC). Armenia has engaged in a peacekeeping mission in Kosovo as part of non-NATO KFOR troops under Greek command. Armenia also had 46 members of its military peacekeeping forces as a part of the Coalition Forces in Iraq War until October 2008.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who else joins Armenia in the CSTO?
Ah, so..
Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan and Uzbekistan