You will be given a definition of a task first, then some input of the task.
From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'executive', Sentence: 'Daniel Magraw , a leading expert in the field of international environmental law and public policy , has just been appointed Executive Director and chief executive officer of the Center for International Environmental Law .'
Output:
executive