28 聚合酶連鎖反應(Polymerase Chain Reaction, PCR)之反應試劑中不包含下列何種物質? (A) oligonucleotide primer(s) (B)耐熱性 DNA polymerase (C) DNA ligase (D)四種去氧核糖核苷三磷酸(deoxyribonucleoside triphosphates)