instruction:
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.
question:
Passage: Most migrations begin with the birds starting off in a broad front. Often, this front narrows into one or more preferred routes termed flyways. These routes typically follow mountain ranges or coastlines, sometimes rivers, and may take advantage of updrafts and other wind patterns or avoid geographical barriers such as large stretches of open water. The specific routes may be genetically programmed or learned to varying degrees. The routes taken on forward and return migration are often different. A common pattern in North America is clockwise migration, where birds flying North tend to be further West, and flying South tend to shift Eastwards. Question: What obsticals will migrating birds avoid?
answer:
large stretches of open water


question:
Passage: Rothko also began using the new synthetic pigments, but not always with happy results. In 1962 he donated to Harvard University a series of large murals of the Passion of Christ whose predominant colors were dark pink and deep crimson. He mixed mostly traditional colors to make the pink and crimson; synthetic ultramarine, cerulean blue, and titanium white, but he also used two new organic reds, Naphtol and Lithol. The Naphtol did well, but the Lithol slowly changed color when exposed to light. Within five years the deep pinks and reds had begun to turn light blue, and by 1979 the paintings were ruined and had to be taken down. Question: What was the result of the change in color in the Rothko Passion of the Christ murals?
answer:
ruined and had to be taken down


question:
Passage: The region also experiences occasional periods of drought, during which the city sometimes has restricted water use by residents. During the late summer and early fall, Raleigh can experience hurricanes. In 1996, Hurricane Fran caused severe damage in the Raleigh area, mostly from falling trees. The most recent hurricane to have a considerable effect on the area was Isabel in 2003. Tornadoes also have on occasion affected the city of Raleigh most notably the November 28, 1988 tornado which occurred in the early morning hours and rated an F4 on the Fujita Tornado Scale and affected Northwestern portions of the city. Also the April 16, 2011 F3 Tornado which affected portions of downtown and North east Raleigh and the suburb of Holly Springs. Question: What does the area experience?
answer:

drought