This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Ex Input:
Passage: An electromagnetic wave refractor in some aperture antennas is a component which due to its shape and position functions to selectively delay or advance portions of the electromagnetic wavefront passing through it. The refractor alters the spatial characteristics of the wave on one side relative to the other side. It can, for instance, bring the wave to a focus or alter the wave front in other ways, generally in order to maximize the directivity of the antenna system. This is the radio equivalent of an optical lens. Question: What is used to allow one to control the function of wave fronts moving through an antenna?

Ex Output:
selectively delay


Ex Input:
Passage: Mach argued that, in effect, the water experiment in an otherwise empty universe would remain flat. But if another object were introduced into this universe, perhaps a distant star, there would now be something relative to which the bucket could be seen as rotating. The water inside the bucket could possibly have a slight curve. To account for the curve that we observe, an increase in the number of objects in the universe also increases the curvature in the water. Mach argued that the momentum of an object, whether angular or linear, exists as a result of the sum of the effects of other objects in the universe (Mach's Principle). Question: Mach argued that the momentum of an object exists as a result of the sum of the effects of what?

Ex Output:
effects of other objects in the universe


Ex Input:
Passage: Before the formation of the Third Coalition, Napoleon had assembled an invasion force, the Armée d'Angleterre, around six camps at Boulogne in Northern France. He intended to use this invasion force to strike at England. They never invaded, but Napoleon's troops received careful and invaluable training for future military operations. The men at Boulogne formed the core for what Napoleon later called La Grande Armée. At the start, this French army had about 200,000 men organized into seven corps, which were large field units that contained 36 to 40 cannons each and were capable of independent action until other corps could come to the rescue. A single corps properly situated in a strong defensive position could survive at least a day without support, giving the Grande Armée countless strategic and tactical options on every campaign. On top of these forces, Napoleon created a cavalry reserve of 22,000 organized into two cuirassier divisions, four mounted dragoon divisions, one division of dismounted dragoons, and one of light cavalry, all supported by 24 artillery pieces. By 1805, the Grande Armée had grown to a force of 350,000 men, who were well equipped, well trained, and led by competent officers. Question: What was the name of the later military organization that the Armée d'Angleterre formed the foundation of?

Ex Output:

La Grande Armée.