What U.S President took the U.S off the Gold standard?

What U.S President took the U.S off the Gold Standard? A Gold company is using this question as promotion,if got right answer you win an ounce(a bar) of gold.They give three possible answer:Ronald Reagan,Richard Nixon and Franklin D. Roosevelt(F.D.R).The question is bit disingenuous because there are two correct answer:FDR took the U.S off gold standard domestically on 6/5/1933.On 8/15/1971 Richard Nixon took the U.S off the international gold standard,hence,ending fix exchange rates and an end to the Bretton Wood system,although the I.M.F and world Bank still exists.