Question: what are the olympic gold medals made of
[{'answer': 'at least 92.5 % silver', 'provenance': [{'wikipedia_id': '526488', 'title': 'Gold medal', 'start_paragraph_id': 21, 'start_character': 49, 'end_paragraph_id': 21, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Olympic Games.\n'}]}, {'answer': 'a minimum of 6 grams of gold'}, {'provenance': [{'wikipedia_id': '526488', 'title': 'Gold medal', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 550, 'bleu_score': 0.9796927878356411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17500999227154336586}, 'section': 'Section::::Olympic Games.\n'}]}]