Question: what is the meaning of d in cameras
[{'answer': 'digital', 'provenance': [{'wikipedia_id': '1181109', 'title': 'Digital single-lens reflex camera', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1181109', 'title': 'Digital single-lens reflex camera', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 952, 'bleu_score': 0.951760208668847, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 627544296929731351}, 'section': 'Section::::Abstract.'}]}]