Question: fatty acids that cannot be synthesized within an organism are referred to as
[{'answer': 'non-essential fatty acids'}, {'provenance': [{'wikipedia_id': '105948', 'title': 'Essential fatty acid', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 0.746184101379139, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7973445115936515056}, 'section': 'Section::::Abstract.'}]}]