Given the task definition and input, reply with output. 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: 'The Committee of Central Bank Governors shall consist of the Governors or Heads of the Central Banks of Member States or their nominees .', Argument/Subject 1: 'governor', Argument/Subject 2: 'state'
be head of