Question: Which company works with petroleum, Apache Corporation or Alexion Pharmaceuticals?
Sentence (from "Alexion Pharmaceuticals"): Alexion Pharmaceuticals Inc. is an American pharmaceutical company best known for its development of Soliris, a drug used to treat the rare disorders atypical hemolytic uremic syndrome (aHUS) and paroxysmal nocturnal hemoglobinuria (PNH).
Relevant evidence: Yes