Question: when did marvel contest of champions come out
[{'answer': 'December 10 , 2014', 'provenance': [{'wikipedia_id': '44729787', 'title': 'Marvel: Contest of Champions', 'start_paragraph_id': 1, 'start_character': 112, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44729787', 'title': 'Marvel: Contest of Champions', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 208, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15698669432878978711}, 'section': 'Section::::Abstract.'}]}]