Question: who is the transfiguration professor in harry potter
[{'answer': 'Minerva McGonagall', 'provenance': [{'wikipedia_id': '947583', 'title': 'Hogwarts staff', 'start_paragraph_id': 20, 'start_character': 11, 'end_paragraph_id': 20, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Notable teachers and staff members.:Gilderoy Lockhart.\n'}]}]