Question: how many terminals are there at vienna airport
[{'answer': 'four', 'provenance': [{'wikipedia_id': '159864', 'title': 'Vienna International Airport', 'start_paragraph_id': 14, 'start_character': 16, 'end_paragraph_id': 14, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Terminals.\n'}]}, {'provenance': [{'wikipedia_id': '159864', 'title': 'Vienna International Airport', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 309, 'bleu_score': 0.926573370537749, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1844848056198205061}, 'section': 'Section::::Terminals.\n'}]}]