Refer to the input text as context and select the correct relationship between 'YPF' and 'BUENOS AIRES' from the available options.
Options: chairperson, founded by, parent organization, headquarters location

BUENOS AIRES Aug 18 Argentina's state-run energy firm YPF will pay about $122 million for stakes in two locally based petrochemical companies as part of its growth strategy to add value to locally produced crude oil, the company said on Tuesday.
headquarters location