GM also declined to comment on reports that in 2016 it would shift production of the Buick Verano sedan from Michigan to China; production of the Buick Regal from Canada to either China or Europe; and also start importing the Buick Cascade convertible from Europe.
Utilize the input text as a context reference, choose the right relationship between 'Buick Regal' and 'Buick' from the options.
Options: subsidiary, original broadcaster, brand, position held