Question: when did the christian fish symbol come from
[{'answer': 'the 2nd century AD', 'provenance': [{'wikipedia_id': '471819', 'title': 'Ichthys', 'start_paragraph_id': 3, 'start_character': 84, 'end_paragraph_id': 3, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Origin.\n'}]}, {'provenance': [{'wikipedia_id': '471819', 'title': 'Ichthys', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1070, 'bleu_score': 0.611361403687086, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15901482843141272714}, 'section': 'Section::::Origin.\n'}]}]