Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In April 2010, Shell announced its intention to divest from downstream business of all African countries except South Africa and Egypt to Vitol and "Helios". In several countries such as Tunisia, protests and strikes broke out. Shell denied rumours of the sellout. Shell continues however upstream activities/extracting crude oil in the oil-rich Niger Delta as well as downstream/commercial activities in South Africa. In June 2013, the company announced a strategic review of its operations in Nigeria, hinting that assets could be divested. In August 2014, the company disclosed it was in the process of finalizing the sale of its interests in four Nigerian oil fields.
When did the company announce a review of South Africa?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
American University economist George Ayittey accused the Arab government of Sudan of practicing acts of racism against black citizens. According to Ayittey, "In Sudan... the Arabs monopolized power and excluded blacks Arab apartheid." Many African commentators joined Ayittey in accusing Sudan of practising Arab apartheid.
Where were they?
A: Sudan

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Some scientific studies suggest that ozone depletion may have a dominant role in governing climatic change in Antarctica (and a wider area of the Southern Hemisphere). Ozone absorbs large amounts of ultraviolet radiation in the stratosphere. Ozone depletion over Antarctica can cause a cooling of around 6 C in the local stratosphere. This cooling has the effect of intensifying the westerly winds which flow around the continent (the polar vortex) and thus prevents outflow of the cold air near the South Pole. As a result, the continental mass of the East Antarctic ice sheet is held at lower temperatures, and the peripheral areas of Antarctica, especially the Antarctic Peninsula, are subject to higher temperatures, which promote accelerated melting. Models also suggest that the ozone depletion/enhanced polar vortex effect also accounts for the recent increase in sea ice just offshore of the continent.
What enhanced the pole vortex?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The first few naval battles were disasters for Rome. However, after training more sailors and inventing a grappling engine, a Roman naval force was able to defeat a Carthaginian fleet, and further naval victories followed. The Carthaginians then hired Xanthippus of Carthage, a Spartan mercenary general, to reorganise and lead their army. He cut off the Roman army from its base by re-establishing Carthaginian naval supremacy. The Romans then again defeated the Carthaginians in naval battle at the Battle of the Aegates Islands and left Carthage with neither a fleet nor sufficient coin to raise one. For a maritime power the loss of their access to the Mediterranean stung financially and psychologically, and the Carthaginians sued for peace.
What battles were initially complete disasters for Rome?
A:
naval battles