Question: materials that clearly transmit visible light are said to be
[{'answer': 'optically transparent', 'provenance': [{'wikipedia_id': '351077', 'title': 'Transparency and translucency', 'start_paragraph_id': 3, 'start_character': 151, 'end_paragraph_id': 3, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '351077', 'title': 'Transparency and translucency', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 382, 'bleu_score': 0.5577109506973721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15395286090831438889}, 'section': 'Section::::Abstract.'}]}]