In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
--------
Question: Why are areas in Neolithic sudan no longer settled?, Context: During the Neolithic Era, before the onset of desertification, around 9500 BCE the central Sudan had been a rich environment supporting a large population ranging across what is now barren desert, like the Wadi el-Qa'ab. By the 5th millennium BCE, the people who inhabited what is now called Nubia, were full participants in the "agricultural revolution", living a settled lifestyle with domesticated plants and animals. Saharan rock art of cattle and herdsmen suggests the presence of a cattle cult like those found in Sudan and other pastoral societies in Africa today. Megaliths found at Nabta Playa are overt examples of probably the world's first known archaeoastronomy devices, predating Stonehenge by some 2,000 years. This complexity, as observed at Nabta Playa, and as expressed by different levels of authority within the society there, likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt.

Answer: now barren desert


Question: What vehicle could you have that you would need lower pressure boiler feed water?, Context: The Rankine cycle and most practical steam engines have a water pump to recycle or top up the boiler water, so that they may be run continuously. Utility and industrial boilers commonly use multi-stage centrifugal pumps; however, other types are used. Another means of supplying lower-pressure boiler feed water is an injector, which uses a steam jet usually supplied from the boiler. Injectors became popular in the 1850s but are no longer widely used, except in applications such as steam locomotives.

Answer: steam locomotives


Question: What kind of accusations were being made in Mt. Elgon?, Context: The armed forces are regularly deployed in peacekeeping missions around the world. Further, in the aftermath of the national elections of December 2007 and the violence that subsequently engulfed the country, a commission of inquiry, the Waki Commission, commended its readiness and adjudged it to "have performed its duty well." Nevertheless, there have been serious allegations of human rights violations, most recently while conducting counter-insurgency operations in the Mt Elgon area and also in the district of Mandera central.

Answer:
human rights violations