Question: when was the last indian head nickel made
[{'answer': '1938', 'provenance': [{'wikipedia_id': '4055812', 'title': 'Buffalo nickel', 'start_paragraph_id': 1, 'start_character': 131, 'end_paragraph_id': 1, 'end_character': 135, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4055812', 'title': 'Buffalo nickel', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 183, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15782906300130936773}, 'section': 'Section::::Abstract.'}]}]