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: Within Galicia are the Autopista AP-9 from Ferrol to Vigo and the Autopista AP-53 (also known as AG-53, because it was initially built by the Xunta de Galicia) from Santiago to Ourense. Additional roads under construction include Autovía A-54 from Santiago de Compostela to Lugo, and Autovía A-56 from Lugo to Ourense. The Xunta de Galicia has built roads connecting comarcal capitals, such as the aforementioned AG-53, Autovía AG-55 connecting A Coruña to Carballo or AG-41 connecting Pontevedra to Sanxenxo. Question: The Autopista AP-53 was originally built by whom?

Ex Output:
Xunta de Galicia


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: Richmond city government consists of a city council with representatives from nine districts serving in a legislative and oversight capacity, as well as a popularly elected, at-large mayor serving as head of the executive branch. Citizens in each of the nine districts elect one council representative each to serve a four-year term. Beginning with the November 2008 election Council terms was lengthened to 4 years. The city council elects from among its members one member to serve as Council President and one to serve as Council Vice President. The city council meets at City Hall, located at 900 E. Broad St., 2nd Floor, on the second and fourth Mondays of every month, except August. Question: What official is in charge of Richmond's executive branch?

Ex Output:

mayor