Utilize the input text as a context reference, choose the right relationship between Martin Winterkorn and Chief Executive Officer from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Volkswagen AG's Chief Executive Officer Martin Winterkorn poses for media during the annual shareholder meeting of Volkswagen AG in Hamburg, Germany, in this April 23, 2009 file photo.

Answer: position_held