Question: who plays the voice of the snake in rango
[{'answer': 'Bill Nighy', 'provenance': [{'wikipedia_id': '34480764', 'title': 'Rango (2011 film)', 'start_paragraph_id': 1, 'start_character': 259, 'end_paragraph_id': 1, 'end_character': 269, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]