Question: the main cause of winter rainfall in pakistan is
[{'answer': 'Western Disturbances', 'provenance': [{'wikipedia_id': '18733464', 'title': 'Climate of Pakistan', 'start_paragraph_id': 3, 'start_character': 12, 'end_paragraph_id': 3, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]