Question: how many species of aloe vera are there
[{'answer': 'about 580 species and hybrids', 'provenance': [{'wikipedia_id': '2441543', 'title': 'List of Aloe species', 'start_paragraph_id': 1, 'start_character': 108, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2441543', 'title': 'List of Aloe species', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 0.7332023424667721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11895984774770009068}, 'section': 'Section::::Abstract.'}]}]