High cholesterol levels are highly correlated with cardiovascular disease. In the Italian town of Limone, however, each of the residents has had high cholesterol levels for many years, and yet they have not developed cardiovascular disease.
HC levels correlated with CVD.
Residents of L have HC but no CVD.
Which one of the following, if true, most helps to explain the unusual health condition of the residents of Limone?(A) Persons who come from families that have enjoyed great longevity tend not to develop cardiovascular disease.
This does not explain people in Limone. 'Persons' is too broad.(B) The stress and pollution found in large cities exacerbate existing cardiovascular disease, but there is little stress or pollution in Limone.
Stress and Pollution exacerbate existing cardiovascular disease. We are looking for causes.(C) The residents of Limone have normal blood sugar levels, and very low blood sugar levels tend to cancel out the cardiovascular effects of a high cholesterol level.
This is stating a fact. Residents of Limone have normal blood sugar levels.... But, this answer mentions that low blood sugar cancels out cardiovascular effects. This does not mention that the residents have low blood sugar levels.(D) The residents of Limone inherited from common ancestors a blood protein that prevents vascular blockage, which is a cause of cardiovascular disease.
Yes. This explains why residents of Limone don't have cardiovascular disease.(E) Olive oil is a staple of the diet in some parts of Italy, but unlike butter, olive oil is a monosaturated fat, and monosaturated fats do not contribute to cardiovascular disease.
This is out of scope.