Question: unsaturated fats are comprised of lipids that contain
[{'answer': 'at least one double bond', 'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'double bond', 'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 244, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4555230113118957705}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4555230113118957705}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'section': 'Section::::Chemistry and nutrition.\n', 'start_paragraph_id': 5, 'end_paragraph_id': 5, 'meta': {'evidence_span': ['Trans unsaturated fats are an exception because the double bond stereochemistry predisposes the carbon chains to assume a linear conformation, which conforms to rigid packing as in plaque formation.', 'The geometry of the cis double bond induces a bend in the molecule, thereby precluding rigid formations (see links above for drawings that illustrate this).']}}]}, {'provenance': [{'wikipedia_id': '264748', 'title': 'Unsaturated fat', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['An unsaturated fat is a fat or fatty acid in which there is at least one double bond within the fatty acid chain. A fatty acid chain is monounsaturated if it contains one double bond, and polyunsaturated if it contains more than one double bond.', 'An unsaturated fat is a fat or fatty acid in which there is at least one double bond within the fatty acid chain. A fatty acid chain is monounsaturated if it contains one double bond, and polyunsaturated if it contains more than one double bond.']}}]}, {'provenance': [{'wikipedia_id': '4421561', 'title': 'Linolenic acid', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Linolenic acid is a type of fatty acid. It can refer to either of two octadecatrienoic acids (i.e. with an 18-carbon chain and three double bonds, which are found in the "cis" configuration), or a mixture of the two. Linolenate (in the form of triglyceride esters of linolenic acid) is often found in vegetable oils; traditionally, such fatty acylates are reported as the fatty acids:', 'Linolenic acid is a type of fatty acid. It can refer to either of two octadecatrienoic acids (i.e. with an 18-carbon chain and three double bonds, which are found in the "cis" configuration), or a mixture of the two']}}]}]