題目下列何種胺基酸可在肝臟中分解為乙醯輔酶A(acetyl-CoA),進而轉變成酮體?A.麩胺酸(glutamate)B.白胺酸(leucine)C.丙胺酸(alanine)D.組胺酸(histidine)官方答案B