Question: what call of duty games has sledgehammer made
[{'answer': 'Call of Duty : WWII', 'provenance': [{'wikipedia_id': '25167565', 'title': 'Sledgehammer Games', 'start_paragraph_id': 15, 'start_character': 76, 'end_paragraph_id': 15, 'end_character': 90, 'bleu_score': 0.668740304976422, 'section': 'Section::::Reception.\n'}]}, {'answer': 'Call of Duty : Modern Warfare 3'}, {'answer': 'Call of Duty : Advanced Warfare'}]