Question: the space shuttle program began with the flight of the challenger apollo mercury columbia explorer
[{'answer': 'Columbia', 'provenance': [{'wikipedia_id': '38458', 'title': 'Space Shuttle program', 'start_paragraph_id': 6, 'start_character': 363, 'end_paragraph_id': 6, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '38458', 'title': 'Space Shuttle program', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 602, 'bleu_score': 0.908979966365112, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2994295897811910988}, 'section': 'Section::::Background.\n'}]}]