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.
Take context from the input text and decide on the accurate relationship between 'Buick Verano' and 'Buick' from the options provided.
Options: operator, brand, publisher, chairperson