Question: the negative plate of a lead acid battery is made of
[{'answer': 'lead', 'provenance': [{'wikipedia_id': '201495', 'title': 'Lead–acid battery', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '201495', 'title': 'Lead–acid battery', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 147, 'bleu_score': 0.714731571540253, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9005894150381643710}, 'section': 'Section::::Electrochemistry.:Charging.\n'}]}]