Analyze the relationship between 'Linn Energy' and 'Petroleum' within the context of the input sentence.
Options: distributed by, location of formation, subsidiary, product/material produced

** Biggest gainers include: Basic Energy Services Inc (NYSE: BAS - news ) up 16 pct at $3.99, Midstates Petroleum Company Inc (NYSE: MPO - news ) up 20 pct at $2.16, Whiting Petroleum Corp (NYSE: WLL - news ) up 14.5 pct at $2.53, Seventy Seven Energy Inc (NYSE: SSE - news ) up 15.2 pct at $2.54, Linn Energy LLC up 19 pct at $2.52
product/material produced