Question: who was the first elected prime minister of nepal
[{'answer': 'Bishweshwar Prasad Koirala', 'provenance': [{'wikipedia_id': '30873565', 'title': 'List of Prime Ministers of Nepal', 'start_paragraph_id': 3, 'start_character': 227, 'end_paragraph_id': 3, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30873565', 'title': 'List of Prime Ministers of Nepal', 'start_paragraph_id': 3, 'start_character': 227, 'end_paragraph_id': 3, 'end_character': 679, 'bleu_score': 0.547750506098572, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5232892301022553425}, 'section': 'Section::::Abstract.'}]}]