Analyze the relationship between 'Caltex' and 'Oil' within the context of the input sentence.
Options: owner of, product/material produced, position held, employer

Trading ex dividend today: APN Outdoor, Adacel Technologies, Blackmores, Caltex Australia, Canterbury Surrey Hills, Cardno, MMA Offshore, Oil Search, Phileo Australia, Ramsay Health Care, Saunders International, Service Stream, SpeedCast International.
product/material produced