Question: who is the current lead singer of five finger death punch
[{'answer': 'Ivan Moody', 'provenance': [{'wikipedia_id': '7397636', 'title': 'Five Finger Death Punch', 'start_paragraph_id': 1, 'start_character': 263, 'end_paragraph_id': 1, 'end_character': 273, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]