Question: Terlingua Creek is a stream in the U.S. state of Texas, it is a tributary of which one of the principal rivers in the southwest United States and northern Mexico (the other being the Colorado River), and begins in south-central Colorado in the United States and flows to the Gulf of Mexico?
{'answer': 'Rio Grande', 'supporting_facts': [['Terlingua Creek', 1], ['Rio Grande', 0]]}