What is the relationship between Energy company and natural 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.

Energy company BG Group (LSE: BG.L - news ) has started up and loaded its first liquefied natural gas from the second production train at the Queensland Curtis LNG (QCLNG) facility in Australia.

Answer: product_or_material_produced