You will be given a definition of a task first, then some input of the task.
Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'But Mary Nichols , chair of the California Air Resources Board , told reporters later at the show that state officials have not been given a definitive date for a decision .', Argument/Subject 1: 'mary nichol', Argument/Subject 2: 'californium air resource board'
Output:
be chair of