Question: what is it called when the president commutes a prison sentence
[{'answer': 'executive clemency', 'provenance': [{'wikipedia_id': '29881359', 'title': 'List of people granted executive clemency by Barack Obama', 'start_paragraph_id': 0, 'start_character': 23, 'end_paragraph_id': 0, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29881359', 'title': 'List of people granted executive clemency by Barack Obama', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 589, 'bleu_score': 0.8589559251090131, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16890034171025009787}, 'section': 'Section::::Abstract.'}]}]