Question: when did nigeria change from right to left driving
[{'answer': '1972', 'provenance': [{'wikipedia_id': '213380', 'title': 'Left- and right-hand traffic', 'start_paragraph_id': 35, 'start_character': 151, 'end_paragraph_id': 35, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::History.:Asia.\n'}]}]