Question: who was leander paes partner in the mixed doubles at the us open in 2008
[{'answer': 'Cara Black', 'provenance': [{'wikipedia_id': '18795624', 'title': '2008 US Open – Mixed Doubles', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]