Question: what is the last grade of high school
[{'answer': 'Twelfth grade', 'provenance': [{'wikipedia_id': '1066040', 'title': 'Twelfth grade', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1066040', 'title': 'Twelfth grade', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 419, 'bleu_score': 0.8331849772054261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5988575481642930471}, 'section': 'Section::::Abstract.'}]}]