Question: what is diamonds rating on the mohs hardness scale
[{'answer': '10', 'provenance': [{'wikipedia_id': '20474', 'title': 'Mohs scale of mineral hardness', 'start_paragraph_id': 7, 'start_character': 112, 'end_paragraph_id': 7, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Minerals.\n'}]}]