Question: Tightrope Walker is an outdoor bronze sculpture that commemorates an American soldier, lawyer, intelligence officer and diplomat best remembered as the wartime head of what?
{'answer': 'Office of Strategic Services', 'supporting_facts': [['Tightrope Walker (sculpture)', 0], ['Tightrope Walker (sculpture)', 1], ['William J. Donovan', 0], ['William J. Donovan', 1]]}