Which type of lipoprotein takes cholesterol from cells or atherosclerotic deposits back to the liver? very low density lipoproteins (vldls) low density lipoproteins (ldls) intermediate density lipoproteins (idls) high density lipoproteins (hdls)?

High density lipoproteins (HDL)

High density lipoprotein can transport back cholesterol and sometimes called "good cholesterol". Patient with too low high-density lipoprotein will be considered having dyslipidemia(disturbance in cholesterol concentration) when other cholesterol considered as dyslipidemia if its too high.

Its either a) or b),wind and water erosion gradually widen the canyon