Information: - A mathematician is someone who uses an extensive knowledge of mathematics in his/her work, typically to solve mathematical problems. - The Tournament of the Towns ("International Mathematics Tournament of the Towns", " ", " ") is a town-based mathematics contest originating in Russia. The contest was created by mathematician Nikolay Konstantinov and has participants from over 100 cities in many different countries. - Paul Erds (; 26 March 1913 20 September 1996) was a Hungarian mathematician. He was one of the most prolific mathematicians of the 20th century. He was known both for his social practice of mathematics (he engaged more than 500 collaborators) and for his eccentric lifestyle ("Time" magazine called him "The Oddball's Oddball"). He devoted his waking hours to mathematics, even into his later yearsindeed, his death came only hours after solving a geometry problem in a conference in Warsaw. - Nikolay Nikolayevich Konstantinov ( Russian : ; born 2 January 1932 ) is a leading Soviet and Russian mathematical educator and organizer of numerous mathematics competitions for high school students . He is best known as the creator and chief organizer of the Tournament of the Towns . For his work he was awarded the Paul Erds award in 1992 . - Russia (from the Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara. Given the information above, choose from the list below the object entity that exhibits the relation 'occupation' with the subject 'nikolay konstantinov'. Choices: - educator - major - mathematician - saint
mathematician

Ques:Information: - The Witwatersrand aka The Reef, is a 56-kilometre-long north-facing scarp in the Gauteng Province of South Africa. It consists of a hard, erosion-resistant quartzite sedimentary rock, over which several north-flowing rivers form waterfalls, which account for the name Witwatersrand, meaning the ridge of white waters in Afrikaans. This eastwest-running scarp can be traced with only one short gap from Bedfordview (about 10km west of O.R. Tambo International Airport) in the east, through Johannesburg and Roodepoort, to Krugersdorp in the west (see the diagram bottom-left below). - South African Airways (SAA) is the flag carrier and largest airline of South Africa, with headquarters in Airways Park on the grounds of OR Tambo International Airport in Kempton Park, Ekurhuleni, Gauteng. The airline flies to 56 destinations worldwide, in partnership with SA Express, SA Airlink and its low cost carrier, Mango, within South Africa and across the continent, and nine intercontinental routes from its Johannesburg hub at OR Tambo International Airport, using a fleet of 54 aircraft. Thuli Mpshe was appointed as the acting CEO of SAA in August after Nico Bezuidenhout, the former acting CEO of SAA returned as CEO of Mango. - Johannesburg (also known as Jozi, Joburg and eGoli) is the largest city in South Africa and is one of the 50 largest urban areas in the world. It is the provincial capital of Gauteng, which is the wealthiest province in South Africa. While Johannesburg is not one of South Africa's three capital cities, it is the seat of the Constitutional Court. The city is located in the mineral-rich Witwatersrand range of hills and is the centre of large-scale gold and diamond trade. - SA Airlink ( Pty ) Ltd. is an airline based in Johannesburg , South Africa . It is privately owned and has developed into South Africa 's first feeder network aimed at linking the smaller towns , regional centers and hubs throughout South Africa . It has code - sharing and schedule co-ordination agreements with South African Airways and South African Express . Given the information above, choose from the list below the object entity that exhibits the relation 'airline hub' with the subject 'airlink'. Choices: - johannesburg - or tambo international airport

Ans:
or tambo international airport