Question: who was the first recipient of bharat ratna to be awarded posthumously
[{'answer': 'Prime Minister Lal Bahadur Shastri', 'provenance': [{'wikipedia_id': '236912', 'title': 'Bharat Ratna', 'start_paragraph_id': 2, 'start_character': 390, 'end_paragraph_id': 2, 'end_character': 424, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '236912', 'title': 'Bharat Ratna', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1056, 'bleu_score': 0.8069821648309, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9231799821915850714}, 'section': 'Section::::Abstract.'}]}]