Question: the river which marks the international border between india and nepal
[{'answer': 'Mahakali River', 'provenance': [{'wikipedia_id': '14746277', 'title': 'List of international border rivers', 'start_paragraph_id': 157, 'start_character': 12, 'end_paragraph_id': 157, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::By region.:Asia.\n'}]}, {'answer': 'Mechi River', 'provenance': [{'wikipedia_id': '14746277', 'title': 'List of international border rivers', 'start_paragraph_id': 158, 'start_character': 12, 'end_paragraph_id': 158, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::By region.:Asia.\n'}]}]