Question: who was the half blood prince in harry potter
[{'answer': 'Snape', 'provenance': [{'wikipedia_id': '858575', 'title': 'Harry Potter and the Half-Blood Prince (film)', 'start_paragraph_id': 6, 'start_character': 448, 'end_paragraph_id': 6, 'end_character': 453, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]