Given the task definition and input, reply with output. In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: What was the recorded population of the city in which Tomic died the year he died there? Passage:Tomic belonged to the first class of six Serbian pilots trained in France in 1912. In August 1914, he participated in the first aerial dogfight of the war, when he exchanged gunfire with an Austro-Hungarian plane over western Serbia. In the winter of 1915, during the Serbian Army's retreat across Albania to the Greek island of Corfu, he evacuated General Petar Bojovic from Scutari by plane, delivered mail by air and transported the Serbian Government's gold and hard currency reserves from Nis to keep them from falling into enemy hands. Following the occupation of Serbia by the Central Powers, Tomic went to France and flew over the Western Front, where he had one confirmed kill. He returned to the Balkans in late 1916, conducted combat missions over Bulgarian-occupied Macedonia and shot down one enemy plane. Tomic continued flying after the war and became head of the Royal Yugoslav Air Force's pursuit squadron in Novi Sad. During World War II, he was captured by the Germans and detained as a prisoner of war. Tomic left Yugoslavia following the war and settled in the United States with his wife. He died in Chicago in 1962.
Links: a. Chicago b. United States c. Great Retreat (Serbian) d. Great Retreat (Serbian)
a