This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

[Q]: Passage: Several species of pines characteristic of the Appalachians are eastern white pine (Pinus strobus ), Virginia pine (Pinus virginiana), pitch pine (Pinus rigida ), Table Mountain pine (Pinus pungens) and shortleaf pine (Pinus echinata). Red pine (Pinus resinosa) is a boreal species that forms a few high elevation outliers as far south as West Virginia. All of these species except white pine tend to occupy sandy, rocky, poor soil sites, which are mostly acidic in character. White pine, a large species valued for its timber, tends to do best in rich, moist soil, either acidic or alkaline in character. Pitch pine is also at home in acidic, boggy soil, and Table Mountain pine may occasionally be found in this habitat as well. Shortleaf pine is generally found in warmer habitats and at lower elevations than the other species. All the species listed do best in open or lightly shaded habitats, although white pine also thrives in shady coves, valleys, and on floodplains.
[A]: What type of species is the pitch pine?


[Q]: Passage: Uranium carbides and uranium nitrides are both relatively inert semimetallic compounds that are minimally soluble in acids, react with water, and can ignite in air to form U
3O
8. Carbides of uranium include uranium monocarbide (UC), uranium dicarbide (UC
2), and diuranium tricarbide (U
2C
3). Both UC and UC
2 are formed by adding carbon to molten uranium or by exposing the metal to carbon monoxide at high temperatures. Stable below 1800 °C, U
2C
3 is prepared by subjecting a heated mixture of UC and UC
2 to mechanical stress. Uranium nitrides obtained by direct exposure of the metal to nitrogen include uranium mononitride (UN), uranium dinitride (UN
2), and diuranium trinitride (U
2N
3).
[A]: Along with uranium monocarbide and uranium dicarbide, what is a unnotable carbide of uranium?


[Q]: Passage: The University of Chicago Library system encompasses six libraries that contain a total of 9.8 million volumes, the 11th most among library systems in the United States. The university's main library is the Regenstein Library, which contains one of the largest collections of print volumes in the United States. The Joe and Rika Mansueto Library, built in 2011, houses a large study space and an automatic book storage and retrieval system. The John Crerar Library contains more than 1.3 million volumes in the biological, medical and physical sciences and collections in general science and the philosophy and history of science, medicine, and technology. The university also operates a number of special libraries, including the D'Angelo Law Library, the Social Service Administration Library, and the Eckhart Library for mathematics and computer science, which closed temporarily for renovation on July 8, 2013. Harper Memorial Library no longer contains any volumes; however it is, in addition to the Regenstein Library, a 24-hour study space on campus.
[A]:
Which University's library system consists of 12 libraries?


