Utilize the input text as a context reference, choose the right relationship between Petrobras and gas from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

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

Answer: product_or_material_produced