Question: The Miller oilfield was discovered by an oil and gas company headquartered in which city ?
Sentence (from "BP"): It is one of the world's seven oil and gas "supermajors", whose performance in 2012 made it the world's sixth-largest oil and gas company, the sixth-largest energy company by market capitalization and the company with the world's twelfth-largest revenue (turnover).
Relevant evidence: No