Question: what was the name of the union ironclad ship
[{'answer': 'Monitor', 'provenance': [{'wikipedia_id': '251489', 'title': 'Ironclad warship', 'start_paragraph_id': 26, 'start_character': 77, 'end_paragraph_id': 26, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Early ironclad ships and battles.:First battles between ironclads: the U.S. Civil War.\n'}]}, {'provenance': [{'wikipedia_id': '251489', 'title': 'Ironclad warship', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 503, 'bleu_score': 0.9757530668325981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2255442490178094205}, 'section': 'Section::::Early ironclad ships and battles.:First battles between ironclads: the U.S. Civil War.\n'}]}]