Question: who is the lead singer in pearl jam
[{'answer': 'Eddie Vedder', 'provenance': [{'wikipedia_id': '5068852', 'title': 'Pearl Jam', 'start_paragraph_id': 1, 'start_character': 127, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5068852', 'title': 'Pearl Jam', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 462, 'bleu_score': 0.5078472280296711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13437736013002903107}, 'section': 'Section::::Abstract.'}]}]