You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

what is the first event mentioned?, Context: The Russian Revolution is the series of revolutions in Russia in 1917, which destroyed the Tsarist autocracy and led to the creation of the Soviet Union. Following the abdication of Nicholas II of Russia, the Russian Provisional Government was established. In October 1917, a red faction revolution occurred in which the Red Guard, armed groups of workers and deserting soldiers directed by the Bolshevik Party, seized control of Saint Petersburg (then known as Petrograd) and began an immediate armed takeover of cities and villages throughout the former Russian Empire.
Solution: Russian Revolution
Why? This is a good example, and the Russian Revolution is the first event mentioned.

New input: What does the "O" in GESO stand for?, Context: Much of Yale University's staff, including most maintenance staff, dining hall employees, and administrative staff, are unionized. Clerical and technical employees are represented by Local 34 of UNITE HERE and service and maintenance workers by Local 35 of the same international. Together with the Graduate Employees and Students Organization (GESO), an unrecognized union of graduate employees, Locals 34 and 35 make up the Federation of Hospital and University Employees. Also included in FHUE are the dietary workers at Yale-New Haven Hospital, who are members of 1199 SEIU. In addition to these unions, officers of the Yale University Police Department are members of the Yale Police Benevolent Association, which affiliated in 2005 with the Connecticut Organization for Public Safety Employees. Finally, Yale security officers voted to join the International Union of Security, Police and Fire Professionals of America in fall 2010 after the National Labor Relations Board ruled they could not join AFSCME; the Yale administration contested the election.
Solution:
Organization