Question: who nicknamed the coast of west africa the gold coast
[{'answer': 'Europeans', 'provenance': [{'wikipedia_id': '195220', 'title': 'Gold Coast (British colony)', 'start_paragraph_id': 2, 'start_character': 10, 'end_paragraph_id': 2, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '195220', 'title': 'Gold Coast (British colony)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 995, 'bleu_score': 0.9880591662583851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 816676155028778474}, 'section': 'Section::::Abstract.'}]}]