Question: who was the first prime minister in nigeria
[{'answer': 'Abubakar Tafawa Balewa', 'provenance': [{'wikipedia_id': '11043364', 'title': 'Prime Minister of Nigeria', 'start_paragraph_id': 4, 'start_character': 273, 'end_paragraph_id': 4, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::History of the office.\n'}]}]