Utilize the input text as a context reference, choose the right relationship between 'Repsol' and 'Petroleum' from the options.
Options: chief executive officer, brand, product/material produced, creator

BP, Statoil (Xetra: 675213 - news ) , Anadarko Petroleum Corp. , Repsol and Total (Swiss: FP.SW - news ) are the main foreign energy firms in Algeria.
product/material produced