Question: how many types of usa visa are there
[{'answer': 'about 185', 'provenance': [{'wikipedia_id': '4766461', 'title': 'Visa policy of the United States', 'start_paragraph_id': 13, 'start_character': 16, 'end_paragraph_id': 13, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Overview.:Entry visas.\n'}]}, {'provenance': [{'wikipedia_id': '4766461', 'title': 'Visa policy of the United States', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 95, 'bleu_score': 0.8852140475440831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3747534846103775165}, 'section': 'Section::::Overview.:Entry visas.\n'}]}]