Question: thorns on plants is a feature of trees in
[{'answer': 'tropical Africa', 'provenance': [{'wikipedia_id': '25725334', 'title': 'Thorns, spines, and prickles', 'start_paragraph_id': 23, 'start_character': 432, 'end_paragraph_id': 23, 'end_character': 447, 'bleu_score': 1.0, 'section': 'Section::::Definitions and technical distinctions.:Other structures.\n'}]}, {'provenance': [{'wikipedia_id': '25725334', 'title': 'Thorns, spines, and prickles', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 1165, 'bleu_score': 0.5555474878740291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17391854522969928951}, 'section': 'Section::::Definitions and technical distinctions.:Other structures.\n'}]}]