Question: where did the dry plate (gelatin-silver) system originate
[{'answer': '1871', 'provenance': [{'wikipedia_id': '614735', 'title': 'Gelatin silver process', 'start_paragraph_id': 3, 'start_character': 69, 'end_paragraph_id': 3, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '614735', 'title': 'Gelatin silver process', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 173, 'bleu_score': 0.9214109120166031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13635792880053606932}, 'section': 'Section::::History.\n'}]}]