Question: what is the evil guy's name in phineas and ferb
[{'answer': 'Dr. Heinz Doofenshmirtz', 'provenance': [{'wikipedia_id': '22388597', 'title': 'List of Phineas and Ferb characters', 'start_paragraph_id': 12, 'start_character': 318, 'end_paragraph_id': 12, 'end_character': 341, 'bleu_score': 1.0, 'section': 'Section::::Main characters.:Perry the Platypus.\n'}]}, {'provenance': [{'wikipedia_id': '22388597', 'title': 'List of Phineas and Ferb characters', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 903, 'bleu_score': 0.970407102359722, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8860402603620632171}, 'section': 'Section::::Main characters.:Dr. Doofenshmirtz.\n'}]}]