Question: where did cristina yang go in season 11
[{'answer': 'Switzerland', 'provenance': [{'wikipedia_id': '42654791', 'title': "Grey's Anatomy (season 11)", 'start_paragraph_id': 6, 'start_character': 106, 'end_paragraph_id': 6, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '42654791', 'title': "Grey's Anatomy (season 11)", 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 829, 'bleu_score': 0.9868845362499331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16524294931195780727}, 'section': 'Section::::Plot.\n'}]}]