Question: when was nutella first sold in the uk
[{'answer': '20 April 1964'}, {'provenance': [{'wikipedia_id': '42801', 'title': 'Nutella', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 305, 'bleu_score': 0.8993371831187911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15331417495867077443}, 'section': 'Section::::History.\n'}]}]