Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.
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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 capital city of', Argument/Subject 1: 'lisbon', Argument/Subject 2: 'portugal'

Answer: Lisbon is the capital of Portugal and largest city in the country , the city is also known as The Town of the Seven Hills .


Question: Relationship: 'be compose of', Argument/Subject 1: 'council', Argument/Subject 2: 'chairman'

Answer:
The ISM is directed by its elected Chairman and by the Institute Council , composed of representatives of the Professors , Scientific Assistants , students and non-scientific staff .