Input: concept: Vietnam War  answers:  ['South Vietnam', 'Australia', 'New Zealand', 'North Vietnam', 'Pathet Lao', 'Philippines', 'Khmer Republic', 'United States of America', 'Khmer Rouge', 'North Korea', 'Viet Cong', 'China', 'Thailand', 'South Korea', 'Kingdom of Laos', 'Taiwan', 'Soviet Union']
Output: 

 what countries was the vietnam war between?