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

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