Question: fetal alcohol syndrome is caused by exposure to a(n)
[{'answer': 'alcohol', 'provenance': [{'wikipedia_id': '1248929', 'title': 'Fetal alcohol spectrum disorder', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1248929', 'title': 'Fetal alcohol spectrum disorder', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 813, 'bleu_score': 0.983804329702269, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6580152724990323329}, 'section': 'Section::::Abstract.'}]}]