The Tom McCarthy-directed "Spotlight", about Boston Globe's Pulitzer Prize-winning investigation of child sex abuse by Catholic priests, won Josh Singer and McCarthy trophies in the original screenplay category.
The film, featuring a stellar ensemble cast of Mark Ruffalo, Rachel McAdams, Michael Keaton, John Slattery, Liev Schreiber, Stanley Tucci, and Billy Crudup, revolves around the investigative team of Boston Globe reporters who relentlessly pursue the story even as they get constantly stalled by those in power.
McCarthy acknowledged the role of journalists in bringing out stories that matter.
"Spotlight" beat off competition from "Bridge of Spies", "Ex Machina", "Inside Out" and "Straight Outta Compton".
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"Big Short", based on the non-fiction 2010 book of the same name by Michael Lewis about the financial crisis of 2007-2008 that was triggered by the build-up of the housing market and the credit bubble, emerged winner in the adapted screenplay category.
Adam McKay and Charles Randolph took home the best adapted screenplay Oscar for their adaptation of the book by Lewis.
"Thank you so much to the Academy. Also thank you to Michael Lewis for writing an amazing book that inspired Charles and I so much," McKay said.