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: Indian astronomer and mathematician Aryabhata (476-550), in his Aryabhatiya (499) introduced a number of trigonometric functions (including sine, versine, cosine and inverse sine), trigonometric tables, and techniques and algorithms of algebra. In 628 AD, Brahmagupta suggested that gravity was a force of attraction. He also lucidly explained the use of zero as both a placeholder and a decimal digit, along with the Hindu-Arabic numeral system now used universally throughout the world. Arabic translations of the two astronomers' texts were soon available in the Islamic world, introducing what would become Arabic numerals to the Islamic World by the 9th century. During the 14th16th centuries, the Kerala school of astronomy and mathematics made significant advances in astronomy and especially mathematics, including fields such as trigonometry and analysis. In particular, Madhava of Sangamagrama is considered the "founder of mathematical analysis". Question: What did Brahmagupta use the number zero for?
answer:
a placeholder and a decimal digit

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Passage: Greece: On March 24, 2008, the Olympic Flame was ignited at Olympia, Greece, site of the ancient Olympic Games. The actress Maria Nafpliotou, in the role of a High Priestess, ignited the torch of the first torchbearer, a silver medalist of the 2004 Summer Olympics in taekwondo Alexandros Nikolaidis from Greece, who handed the flame over to the second torchbearer, Olympic champion in women's breaststroke Luo Xuejuan from China. Following the recent unrest in Tibet, three members of Reporters Without Borders, including Robert Menard, breached security and attempted to disrupt a speech by Liu Qi, the head of Beijing's Olympic organising committee during the torch lighting ceremony in Olympia, Greece. The People's Republic of China called this a "disgraceful" attempt to sabotage the Olympics. On March 30, 2008 in Athens, during ceremonies marking the handing over of the torch from Greek officials to organizers of the Beijing games, demonstrators shouted 'Free Tibet' and unfurled banners; some 10 of the 15 protesters were taken into police detention. After the hand-off, protests continued internationally, with particularly violent confrontations with police in Nepal. Question: Who was the first person to carry the torch?
answer:
Alexandros Nikolaidis

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Passage: In 2005, seventeen countries produced concentrated uranium oxides, with Canada (27.9% of world production) and Australia (22.8%) being the largest producers and Kazakhstan (10.5%), Russia (8.0%), Namibia (7.5%), Niger (7.4%), Uzbekistan (5.5%), the United States (2.5%), Argentina (2.1%), Ukraine (1.9%) and China (1.7%) also producing significant amounts. Kazakhstan continues to increase production and may have become the world's largest producer of uranium by 2009 with an expected production of 12,826 tonnes, compared to Canada with 11,100 t and Australia with 9,430 t. In the late 1960s, UN geologists also discovered major uranium deposits and other rare mineral reserves in Somalia. The find was the largest of its kind, with industry experts estimating the deposits at over 25% of the world's then known uranium reserves of 800,000 tons. Question: How many countries produced concentrated uranium oxides in 2005?
answer:
seventeen