Question: when did us space program resumes after challenger tragedy
[{'answer': '29 September 1988', 'provenance': [{'wikipedia_id': '497721', 'title': 'STS-26', 'start_paragraph_id': 1, 'start_character': 158, 'end_paragraph_id': 1, 'end_character': 175, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '497721', 'title': 'STS-26', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 727, 'bleu_score': 0.8444877934399191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7737382527252173671}, 'section': 'Section::::Abstract.'}]}]