BP, Statoil (Xetra: 675213 - news ) , Anadarko Petroleum Corp. , Repsol and Total (Swiss: FP.SW - news ) are the main foreign energy firms in Algeria.
Refer to the input text as context and select the correct relationship between 'Repsol' and 'Petroleum' from the available options.
Options: product/material produced, brand, creator, chief executive officer