In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Let me give you an example: 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.
The answer to this example can be: Russian Revolution
Here is why: This is a good example, and the Russian Revolution is the first event mentioned.

OK. solve this:
Which happened earlier, the University of Chicago reached the Sweet Sixteen or the university chose to withdraw from the conference?, Context: The Maroons compete in the NCAA's Division III as members of the University Athletic Association (UAA). The university was a founding member of the Big Ten Conference and participated in the NCAA Division I Men's Basketball and Football and was a regular participant in the Men's Basketball tournament. In 1935, the University of Chicago reached the Sweet Sixteen. In 1935, Chicago Maroons football player Jay Berwanger became the first winner of the Heisman Trophy. However, the university chose to withdraw from the conference in 1946 after University President Robert Maynard Hutchins de-emphasized varsity athletics in 1939 and dropped football. (In 1969, Chicago reinstated football as a Division III team, resuming playing its home games at the new Stagg Field.)
Answer:
the University of Chicago reached the Sweet Sixteen