Question: when did the irish potato famine officially start
[{'answer': '1845', 'provenance': [{'wikipedia_id': '14726', 'title': 'Great Famine (Ireland)', 'start_paragraph_id': 1, 'start_character': 76, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]