Utilize the input text as a context reference, choose the right relationship between 'Oando' and 'Petroleum' from the options.
Options: owner of, owned by, 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