Refer to the input text as context and select the correct relationship between 'Petrobras' and 'gas' from the available options.
Options: product/material produced, director/manager, currency, owned by

Thu, Jul 2, 2015, 03:30 BST - UK Markets open in 4 hrs 30 mins Brazil's Petrobras sells $25 million stake in oil, gas field Reuters – 1 hour 57 minutes ago 1,803.50 +17.00
product/material produced