Question: who opened the chamber of secrets in harry potter
[{'answer': 'the Heir of Salazar Slytherin', 'provenance': [{'wikipedia_id': '667368', 'title': 'Harry Potter and the Chamber of Secrets (film)', 'start_paragraph_id': 2, 'start_character': 329, 'end_paragraph_id': 2, 'end_character': 358, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]