In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

[EX Q]: What is Rayleigh scattering?, Context: In nature, the red color of blood comes from hemoglobin, the iron-containing protein found in the red blood cells of all vertebrates. The red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. It also causes the red color of the planet Mars. The red sky at sunset and sunrise is caused by an optical effect known as Rayleigh scattering, which, when the sun is low or below the horizon, increases the red-wavelength light that reaches the eye. The color of autumn leaves is caused by pigments called anthocyanins, which are produced towards the end of summer, when the green chlorophyll is no longer produced. One to two percent of the human population has red hair; the color is produced by high levels of the reddish pigment pheomelanin (which also accounts for the red color of the lips) and relatively low levels of the dark pigment eumelanin.
[EX A]: optical effect

[EX Q]: Which ship is older, the America, or the Enterprise?, Context: With the deactivation of USS Enterprise in December 2012, the U.S. fleet comprises 10 supercarriers. The House Armed Services Seapower subcommittee on 24 July 2007, recommended seven or maybe eight new carriers (one every four years). However, the debate has deepened over budgeting for the $12–14.5 billion (plus $12 billion for development and research) for the 100,000 ton Gerald R. Ford-class carrier (estimated service 2016) compared to the smaller $2 billion 45,000 ton America-class amphibious assault ships, which are able to deploy squadrons of F-35Bs. The first of this class, USS America, is now in active service with another, USS Tripoli, under construction and 9 more are planned.
[EX A]: Enterprise

[EX Q]: what was the inspiration for Vom Himmel hoch, da komm ich her?, Context: Luther was a prolific hymn-writer, authoring hymns such as "Ein feste Burg ist unser Gott" ("A Mighty Fortress Is Our God"), based on Psalm 46, and "Vom Himmel hoch, da komm ich her" ("From Heaven Above to Earth I Come"), based on Luke 2:11–12. Luther connected high art and folk music, also all classes, clergy and laity, men, women and children. His tool of choice for this connection was the singing of German hymns in connection with worship, school, home, and the public arena. He often accompanied the sung hymns with a lute, later recreated as the waldzither that became a national instrument of Germany in the 20th century.
[EX A]:
Luke 2:11–12