Question: what is the meaning of r and d
[{'answer': 'Research and development', 'provenance': [{'wikipedia_id': '254769', 'title': 'Research and development', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '254769', 'title': 'Research and development', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 390, 'bleu_score': 0.840881326013437, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5359382742567387645}, 'section': 'Section::::Abstract.'}]}]