Question: when was the white tower of thessaloniki built
[{'answer': '1430', 'provenance': [{'wikipedia_id': '339521', 'title': 'White Tower of Thessaloniki', 'start_paragraph_id': 1, 'start_character': 419, 'end_paragraph_id': 1, 'end_character': 423, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '339521', 'title': 'White Tower of Thessaloniki', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 397, 'bleu_score': 0.9448140769634361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10365647743138247665}, 'section': 'Section::::History.\n'}]}]