Question: what engine does call of duty run on
[{'answer': 'The IW engine', 'provenance': [{'wikipedia_id': '27443919', 'title': 'IW engine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27443919', 'title': 'IW engine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 347, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8016406727613603463}, 'section': 'Section::::Abstract.'}]}]