Question: what gas does a lead acid battery give off
[{'answer': 'Hydrogen or Oxygen gas', 'provenance': [{'wikipedia_id': '201495', 'title': 'Lead–acid battery', 'start_paragraph_id': 45, 'start_character': 466, 'end_paragraph_id': 45, 'end_character': 488, 'bleu_score': 1.0, 'section': 'Section::::Construction.:Absorbed glass mat (AGM).\n'}]}, {'provenance': [{'wikipedia_id': '201495', 'title': 'Lead–acid battery', 'start_paragraph_id': 45, 'start_character': 0, 'end_paragraph_id': 45, 'end_character': 1220, 'bleu_score': 0.9780561361801231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13689048685604933904}, 'section': 'Section::::Construction.:Absorbed glass mat (AGM).\n'}]}]