Information: - Dimitar Ivanov Popov ( Bulgarian : ) ( October 13 , 1894 -- October 25 , 1975 ) was a Bulgarian organic chemist and an academician of the Bulgarian Academy of Sciences . Prof. D. Ivanov is known by his father 's name Ivanov rather than his family 's name Popov . He is the namesake of the Ivanov reaction in chemistry . - Sofia (or or ;) ("Sofiya",) is the capital and largest city of Bulgaria. The city has a population of 1.26 million, while 1.68 million people live in its metropolitan area. The city is located at the foot of Vitosha Mountain in the western part of the country, within less than drive from the Serbian border. Its location in the centre of the Balkan peninsula means that it is the midway between the Black Sea and the Adriatic Sea, whereas the Aegean Sea is the closest to it. - Bulgaria (tr. '), officially the Republic of Bulgaria (tr. '), is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. With a territory of , Bulgaria is Europe's 16th-largest country. - A national academy is an organizational body, usually operating with state financial support and approval, that co-ordinates scholarly research activities and standards for academic disciplines, most frequently in the sciences but also the humanities. Typically the country's learned societies in individual disciplines will liaise with or be co-ordinated by the national academy. National academies play an important organizational role in academic exchanges and collaborations between countries. - The Bulgarian Academy of Sciences (abbreviated BAS, in Bulgarian: , "Balgarska akademiya na naukite", abbreviated "") is the National Academy of Bulgaria, established in 1869. The Academy, located in Sofia, is autonomous and has a Society of Academicians, Correspondent Members and Foreign Members. It publishes and circulates different scientific works, encyclopedias, dictionaries and journals, and runs its own publishing house. Stefan Vodenicharov has been president of the BAS since 2012. Its budget in 2009 was 84 million leva, or 42.7 million euro. The Bulgarian Space Agency, part of the BAS, has a budget of 1 million euro. After reading the paragraphs above, choose the best answer for the entity that related to 'dimitar ivanov popov' with the relationship of 'place of death'. Choices: - black sea - bulgaria - macedonia - most - sea - serbia - sofia - turkey
A:
sofia