Question: name the apparatus used for electrolysis of water
[{'answer': 'Hofmann voltameter', 'provenance': [{'wikipedia_id': '3006512', 'title': 'Hofmann voltameter', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3006512', 'title': 'Hofmann voltameter', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 690, 'bleu_score': 0.9315196407143821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12916509128795540315}, 'section': 'Section::::Abstract.'}]}]