Question: who is the main character in catch 22
[{'answer': 'Captain John Yossarian', 'provenance': [{'wikipedia_id': '1487567', 'title': 'List of Catch-22 characters', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Significant characters.\n'}]}, {'provenance': [{'wikipedia_id': '1487567', 'title': 'List of Catch-22 characters', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 574, 'bleu_score': 0.8260290691933221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6612694065336585026}, 'section': 'Section::::Significant characters.\n'}]}]