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.
Take context from the input text and decide on the accurate relationship between 'Caltex' and 'Oil' from the options provided.
Options: employer, position held, owner of, product/material produced