Question: who won the wwe championship elimination chamber 2015
[{'answer': 'Dean Ambrose', 'provenance': [{'wikipedia_id': '43740378', 'title': 'Elimination Chamber (2015)', 'start_paragraph_id': 2, 'start_character': 160, 'end_paragraph_id': 2, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43740378', 'title': 'Elimination Chamber (2015)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 315, 'bleu_score': 0.915132941383415, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4197868983374606260}, 'section': 'Section::::Abstract.'}]}]