Reddit Email Print Reprint NEW YORK (TheStreet) --  General Motors ( GM - Get Report ) CEO Mary Barra two weeks ago in Frankfurt presented the latest generation Opel Astra , a car that symbolizes GM's comeback efforts on the continent.
Take context from the input text and decide on the accurate relationship between 'Mary Barra' and 'General Motors' from the options provided.
Options: subsidiary, employer, chairperson, brand