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

Input: Consider Input: 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.

Output: optical effect


Input: Consider Input: What happened earlier, the French invasion in 1672 or Utrecht becoming the centre of the non-Roman Old Catholic Churches in the world?, Context: The fortified city temporarily fell to the French invasion in 1672 (the Disaster Year); where the French invasion was only stopped west of Utrecht at the Old Hollandic Waterline. In 1674, only two years after the French left, the centre of Utrecht was struck by a tornado. The halt to building before construction of flying buttresses in the 15th century now proved to be the undoing of the central section of the cathedral of St Martin church which collapsed; creating the current Dom square between the tower and choir. In 1713, Utrecht hosted one of the first international peace negotiations when the Treaty of Utrecht settled the War of the Spanish Succession. Since 1723 Utrecht became the centre of the non-Roman Old Catholic Churches in the world.

Output: the French invasion in 1672


Input: Consider Input: What 2 types of art are made in Nepal?, Context: Kathmandu is a center for art in Nepal, displaying the work of contemporary artists in the country and also collections of historical artists. Patan in particular is an ancient city noted for its fine arts and crafts. Art in Kathmandu is vibrant, demonstrating a fusion of traditionalism and modern art, derived from a great number of national, Asian, and global influences. Nepali art is commonly divided into two areas: the idealistic traditional painting known as Paubhas in Nepal and perhaps more commonly known as Thangkas in Tibet, closely linked to the country's religious history and on the other hand the contemporary western-style painting, including nature-based compositions or abstract artwork based on Tantric elements and social themes of which painters in Nepal are well noted for. Internationally, the British-based charity, the Kathmandu Contemporary Art Centre is involved with promoting arts in Kathmandu.
Output: idealistic traditional painting known as Paubhas in Nepal and perhaps more commonly known as Thangkas in Tibet, closely linked to the country's religious history and on the other hand the contemporary western-style painting