Question: who is the main character in wizard of oz
[{'answer': 'Dorothy Gale', 'provenance': [{'wikipedia_id': '577561', 'title': 'List of Oz characters (created by Baum)', 'start_paragraph_id': 5, 'start_character': 73, 'end_paragraph_id': 5, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Humans and pets.:Aunt Em and Uncle Henry.\n'}]}, {'provenance': [{'wikipedia_id': '577561', 'title': 'List of Oz characters (created by Baum)', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 972, 'bleu_score': 0.973998353584091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2840467643902953574}, 'section': 'Section::::Humans and pets.:Dorothy Gale.\n'}]}]