Question: where did luke cage get his powers from
[{'answer': 'an experimental procedure', 'provenance': [{'wikipedia_id': '448120', 'title': 'Luke Cage', 'start_paragraph_id': 2, 'start_character': 226, 'end_paragraph_id': 2, 'end_character': 251, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '448120', 'title': 'Luke Cage', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 712, 'bleu_score': 0.9405441894619311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 412061167794940218}, 'section': 'Section::::Abstract.'}]}]