Question: who is the main character of breaking bad
[{'answer': 'Walter White', 'provenance': [{'wikipedia_id': '22529358', 'title': 'List of Breaking Bad and Better Call Saul characters', 'start_paragraph_id': 4, 'start_character': 11, 'end_paragraph_id': 4, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Main characters.:Introduced in "Breaking Bad".\n'}]}]