Problem: Given the question: Extract the answer to the question from the following context. Question: Prior to Sirleaf, what identifier did previous African presidents not have? Context: The subsequent 2005 elections were internationally regarded as the most free and fair in Liberian history. Ellen Johnson Sirleaf, a Harvard-trained economist and former Minister of Finance, was elected as the first female president in Africa. Upon her inauguration, Sirleaf requested the extradition of Taylor from Nigeria and transferred him to the SCSL for trial in The Hague. In 2006, the government established a Truth and Reconciliation Commission to address the causes and crimes of the civil war.
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The answer is:
female


Problem: Given the question: Extract the answer to the question from the following context. Question: What is mined on the surface? Context: Naturally occurring crude asphalt/bitumen impregnated in sedimentary rock is the prime feed stock for petroleum production from "Oil sands", currently under development in Alberta, Canada. Canada has most of the world's supply of natural asphalt/bitumen, covering 140,000 square kilometres (an area larger than England), giving it the second-largest proven oil reserves in the world. The Athabasca oil sands is the largest asphalt/bitumen deposit in Canada and the only one accessible to surface mining, although recent technological breakthroughs have resulted in deeper deposits becoming producible by in situ methods. Because of oil price increases after 2003, producing bitumen became highly profitable, but as a result of the decline after 2014 it became uneconomic to build new plants again. By 2014, Canadian crude asphalt/bitumen production averaged about 2.3 million barrels (370,000 m3) per day and was projected to rise to 4.4 million barrels (700,000 m3) per day by 2020. The total amount of crude asphalt/bitumen in Alberta which could be extracted is estimated to be about 310 billion barrels (50×10^9 m3), which at a rate of 4,400,000 barrels per day (700,000 m3/d) would last about 200 years.
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The answer is:
asphalt/bitumen deposit


Problem: Given the question: Extract the answer to the question from the following context. Question: At what stage of life does Pygmie slavery begin? Context: Many Pygmies belong from birth to Bantus in a relationship many refer to as slavery. The Congolese Human Rights Observatory says that the Pygmies are treated as property the same way "pets" are. On December 30, 2010, the Congolese parliament adopted a law for the promotion and protection of the rights of indigenous peoples. This law is the first of its kind in Africa, and its adoption is a historic development for indigenous peoples on the continent.
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The answer is:
birth