Question: who does jenny slate play in star vs the forces of evil
[{'answer': 'Pony Head', 'provenance': [{'wikipedia_id': '38964738', 'title': 'Star vs. the Forces of Evil', 'start_paragraph_id': 6, 'start_character': 644, 'end_paragraph_id': 6, 'end_character': 653, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]