Question: what was the codename given to the evacuation of dunkirk
[{'answer': 'Operation Dynamo', 'provenance': [{'wikipedia_id': '253767', 'title': 'Dunkirk evacuation', 'start_paragraph_id': 1, 'start_character': 35, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '253767', 'title': 'Dunkirk evacuation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 782, 'bleu_score': 0.9671679735406701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4505460171040183877}, 'section': 'Section::::Abstract.'}]}]