Question: who is the father of amba ambika ambalika
[{'answer': 'the king of Kashi', 'provenance': [{'wikipedia_id': '39431302', 'title': 'Amba (Mahabharata)', 'start_paragraph_id': 1, 'start_character': 64, 'end_paragraph_id': 1, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39431302', 'title': 'Amba (Mahabharata)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 207, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6620218153213600437}, 'section': 'Section::::Background.\n'}]}]