【单选题】A patient presents in your office with very high levels of serum cholesterol. Afte
r a series of tests, you conclude that the patient has high circulating levels of LDL cholesterol, but has normal levels of the liver LDL receptor. One possible explanation for this observation is which of the following?
A、The patient has a mutated form of apoprotein B-100.
B、The inability to selectively remove cholesterol from the LDL complex.
C、The absence of the enzyme lipoprotein lipase.
D、Decreased levels of acyl-CoA: cholesterol acyltransferase
E、Altered phosphorylation of the LDL receptor.