題目葉酸以輔酶型式參與人體的代謝作用,下列組合何者正確?A.二氫葉酸(dihydrofolate)及DNA合成B.二氫葉酸(dihydrofolate)及胺基酸代謝C.四氫葉酸(tetrahydrofolate)及單碳代謝D.四氫葉酸(tetrahydrofolate)及轉硫作用官方答案C