Question: where does pollination take place in flowering plants
[{'answer': 'on the stigma', 'provenance': [{'wikipedia_id': '233609', 'title': 'Pollination', 'start_paragraph_id': 2, 'start_character': 50, 'end_paragraph_id': 2, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]