Question: who sang holding out for a hero in shrek 2
[{'answer': 'Jennifer Saunders', 'provenance': [{'wikipedia_id': '3606935', 'title': 'Holding Out for a Hero', 'start_paragraph_id': 47, 'start_character': 12, 'end_paragraph_id': 47, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Other versions.:Cover versions.\n'}]}]