Question: what is the mean of rx in medical
[{'answer': 'prescription', 'provenance': [{'wikipedia_id': '304263', 'title': 'Medical prescription', 'start_paragraph_id': 0, 'start_character': 8, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '304263', 'title': 'Medical prescription', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 207, 'bleu_score': 0.603389692361826, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3551869078733318810}, 'section': 'Section::::Abstract.'}]}]