In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The Keo Nua Pass in this country is one of the few passes through the Annamese Cordillera (CORE-dee-YARE-uh). This nation's capital includes the Temple of the Trung Sisters and is located on the Red River. The imperial citadel of Dai Noi is found in this country's onetime capital Hue (hway). For 10 points, name this Southeast Asian nation that was reunified in 1975 after a bloody war between the communist north and U.S.-aligned south.
Social Science

This rule holds if the operator algebra for some set of observables is non-trivial; that is true because it is derived via the Schwarz inequality applied to the expectation value of the commutator of two observables operators. It formally bounds the product of the dispersions in two observables. An adapted form of this law applies to energy and time; it applies directly to any two components of spin, but it is best known in its application to position and momentum, the product of the standard deviations of which is at least h-bar over two. FTP, name this principle from quantum mechanics that limits the precision of measurements.
Science

This author's protagonists include a boy traveling to Jersey who discovers his Uncle Jules opening oysters, and a country farmer who is accused of stealing a pocketbook. He wrote about the amoral editor George Duroy, who manipulates his way to the top of French society, in his novel Bel Ami. This author of "La Horla" also wrote a short story about the prostitute Elizabeth Rousset, who is forced to sleep with a Prussian officer after being trapped in Ttes. Best known for a short story about Mathilde Loisel, who discovers that the title piece of jewelry is fake after losing it at a party, FTP, name this French author of "Ball of Fat" and "The Necklace. "

Literature