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: 'be name of', Argument/Subject 1: 'burma', Argument/Subject 2: 'myanmar'
answer:
Burma is the historical name for the country now known as Myanmar .


question:
Relationship: 'say in', Argument/Subject 1: 'obama', Argument/Subject 2: 'washington'
answer:

The Washington Post first reported the selection Sunday on its Web site and said Obama would make an announcement later in the week .