Wed, Jul 15, 2015, 11:40 BST - UK Markets close in 4 hrs 50 mins When Will It Be Time To Buy Explorers Gulf Keystone Petroleum Limited, Enquest Plc And Tullow Oil plc?
Refer to the input text as context and select the correct relationship between 'Tullow Oil' and 'Petroleum' from the available options.
Options: product/material produced, member of, owner of, creator