Question: when did the black death start to spread
[{'answer': '1338 -- 1339'}, {'provenance': [{'wikipedia_id': '4501', 'title': 'Black Death', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 721, 'bleu_score': 0.5490247952671561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 260925188163365450}, 'section': 'Section::::Chronology.:Origins of the disease.\n'}]}]