Question: when was the red cross symbol first used
[{'answer': '1864', 'provenance': [{'wikipedia_id': '2620616', 'title': 'Emblems of the International Red Cross and Red Crescent Movement', 'start_paragraph_id': 10, 'start_character': 85, 'end_paragraph_id': 10, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Symbols of the movement.:Red Cross.\n'}]}, {'provenance': [{'wikipedia_id': '2620616', 'title': 'Emblems of the International Red Cross and Red Crescent Movement', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 337, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12730779661445835520}, 'section': 'Section::::Symbols of the movement.:Red Cross.\n'}]}]