Question: how many stars are in the constellation ursa minor
[{'answer': '7', 'provenance': [{'wikipedia_id': '31773', 'title': 'Ursa Minor', 'start_paragraph_id': 2, 'start_character': 178, 'end_paragraph_id': 2, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]