Question: suggest a pollutant which can be found in the industrial effluent
[{'answer': 'cadmium', 'provenance': [{'wikipedia_id': '1558218', 'title': 'Industrial wastewater treatment', 'start_paragraph_id': 5, 'start_character': 253, 'end_paragraph_id': 5, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::Sources of industrial wastewater.:Battery manufacturing.\n'}]}, {'provenance': [{'wikipedia_id': '1558218', 'title': 'Industrial wastewater treatment', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 366, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3963860182322483494}, 'section': 'Section::::Sources of industrial wastewater.:Battery manufacturing.\n'}]}]