Question: how many forts are there in the solent
[{'answer': 'four', 'provenance': [{'wikipedia_id': '1014528', 'title': 'Palmerston Forts, Portsmouth', 'start_paragraph_id': 2, 'start_character': 42, 'end_paragraph_id': 2, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1014528', 'title': 'Palmerston Forts, Portsmouth', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 263, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 955810230547036284}, 'section': 'Section::::Abstract.'}]}]