Question: how many protons are in a lithium nucleus
[{'answer': 'three', 'provenance': [{'wikipedia_id': '2522652', 'title': 'Isotopes of lithium', 'start_paragraph_id': 15, 'start_character': 19, 'end_paragraph_id': 15, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Lithium-4.\n'}]}, {'provenance': [{'wikipedia_id': '2522652', 'title': 'Isotopes of lithium', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 270, 'bleu_score': 0.7058972997182451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6802387328421435052}, 'section': 'Section::::Lithium-4.\n'}]}]