Question: which materials is used as anode in dry cell
[{'answer': 'ammonium chloride', 'provenance': [{'wikipedia_id': '1178756', 'title': 'Dry cell', 'start_paragraph_id': 4, 'start_character': 157, 'end_paragraph_id': 4, 'end_character': 174, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'manganese dioxide', 'provenance': [{'wikipedia_id': '1178756', 'title': 'Dry cell', 'start_paragraph_id': 3, 'start_character': 181, 'end_paragraph_id': 3, 'end_character': 198, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1178756', 'title': 'Dry cell', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 488, 'bleu_score': 0.9218493128353921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14899390718491720590}, 'section': 'Section::::Abstract.'}]}]