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

Ex Input:
What led to the result that observers in relative motion measure different elapsed times?, Context: In non-relativistic classical mechanics, Newton's concept of "relative, apparent, and common time" can be used in the formulation of a prescription for the synchronization of clocks. Events seen by two different observers in motion relative to each other produce a mathematical concept of time that works sufficiently well for describing the everyday phenomena of most people's experience. In the late nineteenth century, physicists encountered problems with the classical understanding of time, in connection with the behavior of electricity and magnetism. Einstein resolved these problems by invoking a method of synchronizing clocks using the constant, finite speed of light as the maximum signal velocity. This led directly to the result that observers in motion relative to one another measure different elapsed times for the same event.

Ex Output:
a method of synchronizing clocks

Ex Input:
What event caused a potential change in presidental leadership, Context: The House of Representatives currently has 59 members elected for a five-year term, 56 members by proportional representation and 3 observer members representing the Armenian, Latin and Maronite minorities. 24 seats are allocated to the Turkish community but remain vacant since 1964. The political environment is dominated by the communist AKEL, the liberal conservative Democratic Rally, the centrist Democratic Party, the social-democratic EDEK and the centrist EURO.KO. In 2008, Dimitris Christofias became the country's first Communist head of state. Due to his involvement in the 201213 Cypriot financial crisis, Christofias did not run for re-election in 2013. The Presidential election in 2013 resulted in Democratic Rally candidate Nicos Anastasiades winning 57.48% of the vote. As a result, Anastasiades was sworn in on and has been President since 28 February 2013.

Ex Output:
the 201213 Cypriot financial crisis

Ex Input:
Who threw the object that killed Hyacinthus?, Context: Hyacinth or Hyacinthus was one of Apollo's male lovers. He was a Spartan prince, beautiful and athletic. The pair was practicing throwing the discus when a discus thrown by Apollo was blown off course by the jealous Zephyrus and struck Hyacinthus in the head, killing him instantly. Apollo is said to be filled with grief: out of Hyacinthus' blood, Apollo created a flower named after him as a memorial to his death, and his tears stained the flower petals with the interjection , meaning alas. The Festival of Hyacinthus was a celebration of Sparta.

Ex Output:
Apollo