In the context of the input sentence, determine the relationship between 'Duracell' and 'Berkshire Hathaway'.
Options: subsidiary, parent organization, owner of, director/manager

-- U.S. company Berkshire Hathaway (Sao Paolo: BERK34.SA - news ) to acquire U.S. personal care and cosmetics company Procter & Gamble's Duracell battery unit (notified June 23/deadline July 29)
parent organization