Refer to the input text as context and select the correct relationship between 'Sergio Marchionne' and 'Fiat' from the available options.
Options: product/material produced, headquarters location, location of formation, employer

Motley Fool Mobile Fiat Chrysler Gives Up on Merger Talk -- for Now FCA CEO Sergio Marchionne backed away from talk that he is actively pursuing a merger with GM or another automaker.
employer