Question: how many countries are there in central asia
[{'answer': 'five', 'provenance': [{'wikipedia_id': '6742', 'title': 'Central Asia', 'start_paragraph_id': 2, 'start_character': 72, 'end_paragraph_id': 2, 'end_character': 76, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]