Question: one gold bar equal to how many grams
[{'answer': '12.4 kg', 'provenance': [{'wikipedia_id': '3519942', 'title': 'Gold bar', 'start_paragraph_id': 1, 'start_character': 516, 'end_paragraph_id': 1, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3519942', 'title': 'Gold bar', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1133, 'bleu_score': 0.9589414846700801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8186348206078750926}, 'section': 'Section::::Abstract.'}]}]