What is the relationship between 'Lukoil' and 'Petroleum' in the context of the input sentence.
Options: owner of, product/material produced, currency, subsidiary

Thursday 25 June INTERIM EX-DIVIDEND DATE Compass Group (Other OTC: CMPGF - news ) , Gooch & Housego (LSE: GHH.L - news ) , Innovation Group (Other OTC: INVGF - news ) , ITE Group (LSE: ITE.L - news ) , RWS Holdings (LSE: RWS.L - news ) QUARTERLY EX-DIVIDEND DATE Mercantile Investment Trust (The), Real Estate Credit Investments PCC Ltd INTERNATIONAL ECONOMIC ANNOUNCEMENTS Continuing Claims (US) (13:30) GFK Consumer Confidence (GER) (07:00) Initial Jobless Claims (US) (13:30) Non-farm payrolls (US) (13:30) Unemployment rate (US) (13:30) Average hourly earnings (US) (13:30) Personal Consumption Expenditures (US) (13:30) Personal Income (US) (13:30) Personal Spending (US) (13:30) FINALS Cohort, Photo-Me International, Smith (DS) SPECIAL EX-DIVIDEND PAYMENT DATE Jarvis Securities (LSE: JIM.L - news ) , Northern 2 VCT, Small Companies Dividend Trust AGMS 3i Group, Afren (LSE: AFR.L - news ) , Akers Biosciences (NasdaqCM: AKER - news ) , Inc. , Amati VCT (LSE: ATI.L - news ) , Amati Vct 2, Andes Energia (LSE: AEN.L - news ) , Anpario (LSE: ANP.L - news ) , Anpario, BH Macro Ltd. GBP Shares, Bluerock Diamonds (LSE: BRD.L - news ) , Borders & Southern Petroleum (LSE: BOR.L - news ) , Cadogan Petroleum (LSE: CAD.L - news ) , Cadogan Petroleum, Carador Income Fund USD Shares, Cellcast (LSE: CLTV.L - news ) , City Merchants High Yield Trust, Datang International Power Generation Co Ltd., Diamondcorp (LSE: DCP.L - news ) , Faroe Petroleum (LSE: FPM.L - news ) , First Derivatives (LSE: FDP.L - news ) , Golden Saint Resources Ltd (LSE: GSR.L - news ) (DI (KSE: 003160.KS - news ) ), Gresham House (LSE: GHE.L - news ) , Helios Underwriting (LSE: HUW.L - news ) , Hon Hai Precision Industry Co. Ltd. GDR (Reg S), Investors Capital Trust 'A' Shares (Berlin: DI6.BE - news ) , Investors Capital Trust 'B' Shares, Lifeline Scientific Inc (LSE: LSIC.L - news ) ., Lukoil 'B' GDR (Reg S), Magnolia Petroleum (LSE: MAGP.L - news ) , New Century AIM VCT 2, Nighthawk Energy (LSE: HAWK.L - news ) , North River Resources (LSE: NRRP.L - news ) , Pactolus Hungarian Property, Photonstar LED Group, Porta Communications (LSE: PTCM.L - news ) , PowerFilm Inc (LSE: PFLM.L - news ) .
product/material produced