Question: who is the lead singer of shocking blue
[{'answer': 'Maria Elisabeth Ender', 'provenance': [{'wikipedia_id': '8240863', 'title': 'Mariska Veres', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8240863', 'title': 'Mariska Veres', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 413, 'bleu_score': 0.9111620659625651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6558382939867302781}, 'section': 'Section::::Abstract.'}]}]