Refer to the input text as context and select the correct relationship between 'Buick LaCrosse' and 'Buick' from the available options.
Options: parent organization, stock exchange, brand, currency

The expansion covers the 2005 Buick LaCrosse and the 2007 Pontiac Grand Prix in the U.S., as well as the 2005 Buick Allure in Canada.
brand