Question: The M2 light tank, officially Light Tank, M2, was an American pre-World War II light tank, the most common model, the M2A4, was equipped with one 37 mm M5 gun and five of which .30 caliber medium machine gun that was widely used during the 20th century, especially during World War II, the Korean War, and the Vietnam War?
{'answer': 'M1919 Browning', 'supporting_facts': [['M2 light tank', 1], ['M1919 Browning machine gun', 0]]}