Refer to the input text as context and select the correct relationship between 'Oando' and 'Petroleum' from the available options.
Options: owned by, owner of, product/material produced, subsidiary

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.
product/material produced