Question: The GBU-28 is a 5,000-pound laser-guided "bunker busting" bomb produced originally by an arsenal on the west bank of the Hudson River that has been what since 1966?
{'answer': 'National Historic Landmark', 'supporting_facts': [['GBU-28', 0], ['Watervliet Arsenal', 0], ['Watervliet Arsenal', 2]]}