Utilize the input text as a context reference, choose the right relationship between Premier Oil and Public Limited Company from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

FTSE 250 - Risers Synergy Health (SYR) 2,237.00p +41.58% Evraz (EVR) 74.10p +7.39% Jimmy Choo (CHOO) 149.90p +6.46% Premier Oil (PMO) 67.00p +4.85% Indivior (Berlin: 2IV.BE - news ) (INDV) 229.20p +4.71% Debenhams (DEB) 79.20p +4.69% Ted Baker (TED) 3,163.00p +4.67% Card Factory (LSE: CARD.L - news ) (CARD) 398.80p +4.48% Man Group (LSE: EMG.L - news ) (EMG) 160.30p +4.36% Pennon Group (Other OTC: PEGRF - news ) (PNN) 747.50p +3.82% FTSE 250 - Fallers Aggreko (EUREX: AGKF.EX - news ) (AGK) 903.50p -3.01% Acacia Mining (ACA) 243.60p -2.99% Kaz Minerals (KAZ) 101.70p -2.96% Mitchells & Butlers (LSE: MAB.L - news ) (MAB) 322.10p -2.48% Centamin (DI (KSE: 003160.KS - news ) ) (CEY) 62.75p -1.57% Nostrum Oil & Gas (Stuttgart: 3NO.SG - news ) (NOG (Taiwan OTC: 5279.TWO - news ) ) 480.60p -1.50% Polymetal International (Other OTC: AUCOY - news ) (POLY) 547.00p -1.35% UDG Healthcare Public Limited Company (UDG) 510.50p -1.16% Sophos Group (LSE: SOPH.L - news ) (SOPH) 240.20p -0.83% Greencore Group (LSE: GNC.L - news ) (GNC) 288.70p -0.79%

Answer: legal_form