Use a disfluent question or a proper question and find the answer to the question based on the given context or return None if an answer can't be found. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

[EX Q]: proper question: What forces can be modeled using ideal friction strings? 
 disfluent question: What do er uh what forces can be modeled using ideal friction strings? 
 context: Tension forces can be modeled using ideal strings that are massless, frictionless, unbreakable, and unstretchable. They can be combined with ideal pulleys, which allow ideal strings to switch physical direction. Ideal strings transmit tension forces instantaneously in action-reaction pairs so that if two objects are connected by an ideal string, any force directed along the string by the first object is accompanied by a force directed along the string in the opposite direction by the second object. By connecting the same string multiple times to the same object through the use of a set-up that uses movable pulleys, the tension force on a load can be multiplied. For every string that acts on a load, another factor of the tension force in the string acts on the load. However, even though such machines allow for an increase in force, there is a corresponding increase in the length of string that must be displaced in order to move the load. These tandem effects result ultimately in the conservation of mechanical energy since the work done on the load is the same no matter how complicated the machine.
[EX A]: None

[EX Q]: proper question: What has had a negative impact on the labor markets in the UN? 
 disfluent question: What has had a negative impact on the labor markets in Scandinavia, apologies I mean the UN? 
 context: Sociologist Jake Rosenfield of the University of Washington asserts that the decline of organized labor in the United States has played a more significant role in expanding the income gap than technological changes and globalization, which were also experienced by other industrialized nations that didn't experience steep surges in inequality. He points out that nations with high rates of unionization, particularly in Scandinavia, have very low levels of inequality, and concludes the historical pattern is clear; the cross-national pattern is clear: high inequality goes hand-in-hand with weak labor movements and vice-versa.
[EX A]: None

[EX Q]: proper question: Who wrote the American Times bestselling book titled The Closing of the American Mind? 
 disfluent question: When was or wait Who wrote the American Times bestselling book titled The Closing of the American Mind? 
 context: In literature, author of the New York Times bestseller Before I Fall Lauren Oliver, Pulitzer Prize winning novelist Philip Roth, Canadian-born Pulitzer Prize and Nobel Prize for Literature winning writer Saul Bellow, political philosopher, literary critic and author of the New York Times bestseller The Closing of the American Mind Allan Bloom, ''The Good War author Studs Terkel, American writer, essayist, filmmaker, teacher, and political activist Susan Sontag, analytic philosopher and Stanford University Professor of Comparative Literature Richard Rorty, and American writer and satirist Kurt Vonnegut are notable alumni.
[EX A]:
None