instruction:
Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.
question:
Relationship: 'be head of', Argument/Subject 1: 'president', Argument/Subject 2: 'executive'
answer:
The service has been dubbed Derivatives Collateral Net and automatically aggregates and nets the overall collateral obligations of its participants , explains Art Certosimo , executive vice president and head of Broker-Dealer Services at the bank .


question:
Relationship: 'blame', Argument/Subject 1: 'indium', Argument/Subject 2: 'pakistan'
answer:
India immediately blamed Pakistan 's intelligence service , ISI , and accused it of bombings in Mumbai , Delhi , Ahmadabad and Bangalore .


question:
Relationship: 'be editor of', Argument/Subject 1: 'kristol', Argument/Subject 2: 'weekly standard'
answer:

Bill Kristol , editor of the Weekly Standard is well-known as a shrewd political observer and commentator .