Question: who's the lead singer of five finger death punch
[{'answer': 'Ivan L. Moody'}, {'provenance': [{'wikipedia_id': '7398524', 'title': 'Ivan Moody (vocalist)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 368, 'bleu_score': 0.6943356040293801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15619210132584482223}, 'section': 'Section::::Abstract.'}]}]