Question: who is the last ruler of kushan dynasty
[{'answer': 'Vasudeva I', 'provenance': [{'wikipedia_id': '345041', 'title': 'Kushan Empire', 'start_paragraph_id': 44, 'start_character': 184, 'end_paragraph_id': 44, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Main Kushan rulers.:Huvishka (c. 160 – c. 190).\n'}]}, {'provenance': [{'wikipedia_id': '345041', 'title': 'Kushan Empire', 'start_paragraph_id': 46, 'start_character': 0, 'end_paragraph_id': 46, 'end_character': 498, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1253940805634791282}, 'section': 'Section::::Main Kushan rulers.:Vasudeva I (c. 190 – c. 230).\n'}]}]