Question: what is the chemical formula for the base rubidium hydroxide
[{'answer': 'RbOH', 'provenance': [{'wikipedia_id': '2228572', 'title': 'Rubidium hydroxide', 'start_paragraph_id': 1, 'start_character': 25, 'end_paragraph_id': 1, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2228572', 'title': 'Rubidium hydroxide', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4819109187315154426}, 'section': 'Section::::Abstract.'}]}]