Take context from the input text and decide on the accurate relationship between 'Sergio Marchionne' and 'Fiat' from the options provided.
Options: employer, headquarters location, location of formation, product/material produced

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