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.
In the context of the input sentence, determine the relationship between 'Buick Regal' and 'Buick'.
Options: position held, subsidiary, original broadcaster, brand