Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.

[EX Q]: Relationship: 'be head of', Argument/Subject 1: 'president', Argument/Subject 2: 'executive'
[EX A]: 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 .

[EX Q]: Relationship: 'be bear in', Argument/Subject 1: 'ross', Argument/Subject 2: 'london'
[EX A]: Ross was born in London , Canada West , on May 12 , 1856 , and moved with his family to Manitoba in the early 1870s .

[EX Q]: Relationship: 'be region in', Argument/Subject 1: 'patagonium', Argument/Subject 2: 'argentina'
[EX A]:
Its fossil was unearthed in the Patagonia region of Argentina in 1994 .