Question: how many different types of spruce trees are there
[{'answer': 'about 35 species', 'provenance': [{'wikipedia_id': '170718', 'title': 'Spruce', 'start_paragraph_id': 1, 'start_character': 51, 'end_paragraph_id': 1, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '170718', 'title': 'Spruce', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 727, 'bleu_score': 0.533394082760276, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11328379172539530137}, 'section': 'Section::::Abstract.'}]}]