Rain Man received overwhelmingly positive reviews, praising Hoffman's performance and the wit and sophistication of the screenplay, and was the highest-grossing film of 1988. The film won four Oscars at the 61st Academy Awards (March 1989), including Best Picture, Best Original Screenplay, Best Director, and Best Actor in a Leading Role for Hoffman. Its crew received an additional four nominations. The film also won the Golden Bear at the 39th Berlin International Film Festival.

Is it true that did dustin hoffman won an award for rainman?
yes