Question: what is the use of tannin in plant
[{'answer': 'protection from predation', 'provenance': [{'wikipedia_id': '61983', 'title': 'Tannin', 'start_paragraph_id': 3, 'start_character': 97, 'end_paragraph_id': 3, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'as pesticides', 'provenance': [{'wikipedia_id': '61983', 'title': 'Tannin', 'start_paragraph_id': 3, 'start_character': 134, 'end_paragraph_id': 3, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'regulating plant growth', 'provenance': [{'wikipedia_id': '61983', 'title': 'Tannin', 'start_paragraph_id': 3, 'start_character': 167, 'end_paragraph_id': 3, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '61983', 'title': 'Tannin', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 464, 'bleu_score': 0.8813562166528051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14118749660293336495}, 'section': 'Section::::Abstract.'}]}]