Question: which season did matt smith became the doctor
[{'answer': 'Series 5', 'provenance': [{'wikipedia_id': '5585308', 'title': 'Eleventh Doctor', 'start_paragraph_id': 19, 'start_character': 79, 'end_paragraph_id': 19, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Appearances.:Television.\n'}]}]