Question: what type of port is used by flash drives
[{'answer': 'USB mass storage device class', 'provenance': [{'wikipedia_id': '400414', 'title': 'USB flash drive', 'start_paragraph_id': 3, 'start_character': 25, 'end_paragraph_id': 3, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '400414', 'title': 'USB flash drive', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 610, 'bleu_score': 0.9164448809511141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15077820752684128762}, 'section': 'Section::::Abstract.'}]}]