Question: who developed a set of postulates to prove that specific microorganisms cause disease
[{'answer': 'Robert Koch', 'provenance': [{'wikipedia_id': '147009', 'title': "Koch's postulates", 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Friedrich Loeffler', 'provenance': [{'wikipedia_id': '147009', 'title': "Koch's postulates", 'start_paragraph_id': 1, 'start_character': 169, 'end_paragraph_id': 1, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '147009', 'title': "Koch's postulates", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 817, 'bleu_score': 0.9424986462455891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1971571568005168618}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '147009', 'title': "Koch's postulates", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The postulates were formulated by Robert Koch and Friedrich Loeffler', "Koch's postulates () are four criteria designed to establish a causative relationship between a microbe and a disease. The postulates were formulated by Robert Koch and Friedrich Loeffler in 1884, based on earlier concepts described by"]}}]}]