Question: who played shere khan in the jungle book
[{'answer': 'Idris Elba', 'provenance': [{'wikipedia_id': '43650667', 'title': 'The Jungle Book (2016 film)', 'start_paragraph_id': 1, 'start_character': 576, 'end_paragraph_id': 1, 'end_character': 586, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]