Question: when was the term acid rain first used
[{'answer': '1852', 'provenance': [{'wikipedia_id': '3263', 'title': 'Acid rain', 'start_paragraph_id': 8, 'start_character': 120, 'end_paragraph_id': 8, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3263', 'title': 'Acid rain', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 250, 'bleu_score': 0.5180600283962511, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11919664148584437467}, 'section': 'Section::::History.\n'}]}]