Question: which country did the first nandos restaurant open in 1987
[{'answer': 'South Africa', 'provenance': [{'wikipedia_id': '248288', 'title': "Nando's", 'start_paragraph_id': 1, 'start_character': 13, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]