You will be given a definition of a task first, then some input of the task.
Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

In February 2009, James L. Jones, then-chairman of the Atlantic Council, stepped down in order to serve as President Obama's new National Security Advisor and was succeeded by Senator Chuck Hagel.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Who led Atlantic Council?