Question: who was considered the head of the house in ancient china
[{'answer': 'sovereign', 'provenance': [{'wikipedia_id': '309437', 'title': 'Chinese nobility', 'start_paragraph_id': 2, 'start_character': 33, 'end_paragraph_id': 2, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '309437', 'title': 'Chinese nobility', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 665, 'bleu_score': 0.9563334828258161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17935033296594367427}, 'section': 'Section::::Sovereign and ruling family ranks.\n'}]}]