Question: what is the meaning of yellow card in fifa
[{'answer': 'officially cautioned', 'provenance': [{'wikipedia_id': '5278652', 'title': 'Penalty card', 'start_paragraph_id': 7, 'start_character': 107, 'end_paragraph_id': 7, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Commonly used penalty cards.:Yellow card.\n'}]}, {'provenance': [{'wikipedia_id': '5278652', 'title': 'Penalty card', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 864, 'bleu_score': 0.9287116124154651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1133344945286302713}, 'section': 'Section::::Commonly used penalty cards.:Yellow card.\n'}]}]