Question: where did the vibranium for captain america's shield come from
[{'answer': 'Wakanda', 'provenance': [{'wikipedia_id': '3688898', 'title': "Captain America's shield", 'start_paragraph_id': 10, 'start_character': 245, 'end_paragraph_id': 10, 'end_character': 252, 'bleu_score': 1.0, 'section': 'Section::::Original shield.\n'}]}, {'provenance': [{'wikipedia_id': '3688898', 'title': "Captain America's shield", 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 528, 'bleu_score': 0.9066294609209791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17847035248665913620}, 'section': 'Section::::Original shield.\n'}]}]