The equities are Beco Petroleum Product Plc, Conoil Plc, Eterna Plc, Forte Oil PLC, Mobil Oil Nigeria Plc, MRS Oil Nigeria Plc, Total Nigeria Plc, Oando Plc and Seplat Petroleum Development Company Plc.
Analyze the relationship between 'Oando' and 'Petroleum' within the context of the input sentence.
Options: owned by, subsidiary, owner of, product/material produced