Question: the name given to the east to west rotation of venus
[{'answer': 'retrograde', 'provenance': [{'wikipedia_id': '23994165', 'title': 'Retrograde and prograde motion', 'start_paragraph_id': 1, 'start_character': 464, 'end_paragraph_id': 1, 'end_character': 474, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]