What is the relationship between Petrobras and Gas in the context of the input sentence. Choose an answer from: 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.

Today we have with us Roberto Castello Branco, Petrobras CEO; Andrea Almeida, Chief Financial and Investor Relations Officer; Anelise Lara, Chief Refining and Natural Gas Officer; André Chiarini, Chief Logistics Officer; Carlos Alberto Pereira de Oliveira, Chief Exploration and Production Officer; Marcelo Zenkner, Chief Governance and Compliance Officer; Nicolás Simone, Chief Digital Transformation and Innovation Officer; Roberto Ardenghy, Chief Institutional Relations Officer; and Rudimar Lorenzatto, Chief Production Development Officer.

Answer: product_or_material_produced