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