29 抗癌藥氟尿嘧啶(5-fluorouracil)被認為是“自殺型抑制劑”,它可抑制下列何種酵素?(A)Dihydrofolate reductase(B)Tetrahydrofolate reductase(C)Thymidylate synthase(D)Ribonucleotide reductase