Question: where did they get the vibranium to make captain americas shield
[{'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'}]}, {'answer': "King T'Chaka of the African nation Wakanda"}, {'provenance': [{'wikipedia_id': '3688898', 'title': "Captain America's shield", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11271003775422750095}, 'section': 'Section::::Abstract.'}]}, {'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': 11271003775422750095}, 'section': 'Section::::Original shield.\n'}]}, {'provenance': [{'wikipedia_id': '3688898', 'title': "Captain America's shield", 'section': 'Section::::Original shield.\n', 'start_paragraph_id': 10, 'end_paragraph_id': 10, 'meta': {'evidence_span': ["According to the tale, King T'Chaka of the African nation Wakanda met Captain America in early 1941 and gave him a sample of vibranium, an alien metal with unique vibration-absorption properties and found only in Wakanda and the Savage Land. The vibranium was used to make Captain America's circular shield and his triangular one was retired.", "King T'Chaka of the African nation Wakanda met Captain America in early 1941 and gave him a sample of vibranium, an alien metal with unique vibration-absorption properties and found only in Wakanda and the Savage Land. The vibranium was used to make Captain America's circular shield and his triangular one was retired."]}}]}, {'provenance': [{'wikipedia_id': '32813', 'title': 'Vibranium', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Mined only in Wakanda, the metal is associated with Black Panther, who wears a suit of vibranium, and with Captain America, who bears a vibranium/steel alloy shield.', 'Mined only in Wakanda, the metal is associated with Black Panther, who wears a suit of vibranium, and with Captain America, who bears a vibranium/steel alloy shield.']}}]}]