Question: who has been trained by ra's al ghul
[{'answer': 'Bruce Wayne', 'provenance': [{'wikipedia_id': '481619', 'title': "Ra's al Ghul", 'start_paragraph_id': 8, 'start_character': 817, 'end_paragraph_id': 8, 'end_character': 828, 'bleu_score': 1.0, 'section': 'Section::::Character overview.\n'}]}, {'provenance': [{'wikipedia_id': '481619', 'title': "Ra's al Ghul", 'start_paragraph_id': 127, 'start_character': 59, 'end_paragraph_id': 127, 'end_character': 1276, 'bleu_score': 0.671627185105611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3616322016127966241}, 'section': 'Section::::In other media.:Film.:Live action.\n'}]}]