In the context of the input sentence, determine the relationship between 'classic' and 'General Motors'.
Options: chief executive officer, distribution format, manufacturer, director/manager

The automaker says that Post to Facebook GM, Kettering converting famous factory to car museum DETROIT -- General Motors and Kettering University will convert a historic car factory in Flint, Mich., into an archive and research center that will house a collection of classic cars.
manufacturer