Question: who got rajiv gandhi khel ratna award 2017
[{'answer': 'Hockey player Sardara Singh'}, {'answer': 'Para Athlete Javelin thrower Devendra Jhajharia'}, {'provenance': [{'wikipedia_id': '2552139', 'title': 'Rajiv Gandhi Khel Ratna', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 720, 'bleu_score': 0.742385280029593, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18003390311734061889}, 'section': 'Section::::Abstract.'}]}]