題目下列何者具有保護細胞膜的作用,缺乏時易造成溶血性貧血(hemolytic anemia)?A.鈷胺素(cobalamin)B.視網醇(retinol)C.四氫葉酸(tetrahydrofolate)D.生育醇(tocopherol)官方答案D