Question: who was the leader of the shield wwe
[{'answer': 'Dean Ambrose', 'provenance': [{'wikipedia_id': '37762582', 'title': 'The Shield (professional wrestling)', 'start_paragraph_id': 1, 'start_character': 72, 'end_paragraph_id': 1, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37762582', 'title': 'The Shield (professional wrestling)', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 297, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6791173050476750725}, 'section': 'Section::::Characters.\n'}]}]