Question: beri beri is a disease caused by the deficiency of
[{'answer': 'thiamine ( vitamin B1 )', 'provenance': [{'wikipedia_id': '5759935', 'title': 'Thiamine deficiency', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]