27.下列何種基因的變異最不會造成家族性高膽固醇血症(familial hypercholesterolemia)？ (A)low-density lipoprotein receptor(LDLR) (B)proprotein convertase subtilisin/kexin type 9(PCSK9) (C)ATP-binding cassette A1(ABCA1) (D)autosomal recessive hypercholesterolemia(ARH1)