Question: when was castillo san felipe del morro built
[{'answer': '16th Century', 'provenance': [{'wikipedia_id': '707758', 'title': 'Castillo San Felipe del Morro', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]