Question: who was the only member of the apollo 11 moon expedition who did not walk on the moon
[{'answer': 'Michael Collins', 'provenance': [{'wikipedia_id': '97666', 'title': 'Michael Collins (astronaut)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '97666', 'title': 'Michael Collins (astronaut)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 676, 'bleu_score': 0.7240784415872791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10565458757953683380}, 'section': 'Section::::Abstract.'}]}]