Question: who asserted that the most fundamental element is water
[{'answer': 'Thales', 'provenance': [{'wikipedia_id': '1168', 'title': 'Anaximander', 'start_paragraph_id': 1, 'start_character': 208, 'end_paragraph_id': 1, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1168', 'title': 'Anaximander', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 1435, 'bleu_score': 0.9912085779363331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11210518511188573476}, 'section': 'Section::::Biography.\n'}]}]