Question: who is the new lead singer for ac dc
[{'answer': 'Axl Rose', 'provenance': [{'wikipedia_id': '149225', 'title': 'AC/DC', 'start_paragraph_id': 3, 'start_character': 909, 'end_paragraph_id': 3, 'end_character': 917, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]