Question: who played tom riddle in harry potter 2
[{'answer': 'Christian Peter Coulson', 'provenance': [{'wikipedia_id': '2262540', 'title': 'Christian Coulson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2262540', 'title': 'Christian Coulson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 0.816927647530702, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14235753113049297704}, 'section': 'Section::::Abstract.'}]}]