Question: the chemicals produced in plants which stimulate growth are called
[{'answer': 'Plant hormones', 'provenance': [{'wikipedia_id': '256641', 'title': 'Plant hormone', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]