British actor Daniel Day-Lewis, 55, scored a historic third Best Actor Oscar for his turn as the 16th US President Abraham Lincoln in Steven Spielberg's civil-war set drama 'Lincoln'.
He has become the first actor to win the most number of Best Actor Oscars. His previous Oscars were for 'My Left Foot' in 1989 and 'There Will Be Blood' in 2007.
'Argo' saw off tough competition from eight other films --including 'Lincoln', 'Life of Pi', 'Amour', 'Django Unchained' and 'Zero Dark Thirty'-- to walk away with the top award.
'Argo' was declared a winner by Jack Nicholson and First Lady Michelle Obama, who tuned in through a videolink, making an unprecedented appearance from White House in a shimmery silver gown.
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The film, based on real incidents, narrates the near impossible escape story when CIA pulled out six US diplomats from Iran in 1979 by posing as a fake film crew. It won three trophies --best picture, best adapted screenplay and best editing-- out of its seven nominations.
"Thank you, movie god. I need to thank Yann Martel for writing this inspiring book," said Lee before commending his Indian cast and crew and ending his speech with 'Namaste'.