Question: what work written by calvin became the textbook for reformed theology
[{'answer': 'Institutes of the Christian Religion', 'provenance': [{'wikipedia_id': '21224219', 'title': 'John Calvin bibliography', 'start_paragraph_id': 3, 'start_character': 69, 'end_paragraph_id': 3, 'end_character': 105, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21224219', 'title': 'John Calvin bibliography', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1008, 'bleu_score': 0.9873009432531991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14514414636202472713}, 'section': 'Section::::Abstract.'}]}]