Question: where did river niger and river benue meet
[{'answer': 'at Lokoja in Nigeria', 'provenance': [{'wikipedia_id': '21437', 'title': 'Niger River', 'start_paragraph_id': 19, 'start_character': 656, 'end_paragraph_id': 19, 'end_character': 676, 'bleu_score': 1.0, 'section': 'Section::::Geography.\n'}]}, {'provenance': [{'wikipedia_id': '21437', 'title': 'Niger River', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 888, 'bleu_score': 0.9874601949752461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7381710374859370044}, 'section': 'Section::::Geography.\n'}]}]