Which ONE of the following is not a predisposing factor for atheroma?

The answer is B. High levels of serum HDL are associated with decreased risk of ischaemic heart disease; in vitro, HDL results in transfer of cholesterol from the intima of cultured aorta to the culture medium.

High level of serum LDL is the major risk factor of atheroma (C); the others increase the risk by unknown mechanism.