Answer the following question, with explanation first.
Marion Mitchell Morrison (born Marion Robert Morrison; May 26, 1907 -- June 11, 1979), known professionally as John Wayne and nicknamed "The Duke", was an American actor and filmmaker. An Academy Award-winner for True Grit (1969), Wayne was among the top box office draws for three decades.\n\nBased on this passage, what movie did john wayne get an oscar for?

True Grit ( 1969 )
The relevant sentence in the passage is: An Academy Award-winner for True Grit (1969), Wayne was among the top box office draws for three decades.

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Thus, the answer is True Grit ( 1969 )