Question: when was the first superman comic book published
[{'answer': 'June 1938', 'provenance': [{'wikipedia_id': '3513216', 'title': 'Publication history of Superman', 'start_paragraph_id': 7, 'start_character': 59, 'end_paragraph_id': 7, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Early years.\n'}]}, {'provenance': [{'wikipedia_id': '3513216', 'title': 'Publication history of Superman', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 969, 'bleu_score': 0.987691721403756, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10578800156187942251}, 'section': 'Section::::Early years.\n'}]}]