62.下圖為牙齒磨片(ground section)之組織學照片,箭頭所指年輪狀之構造為下列何者?(A)歐文氏外形線(contour line of Owen)(B)瑞氏紋(striae of Retzius)(C)魏克罕氏紋(striae of Wickham)(D)方艾勃納氏增生線(incremental line of Von Ebner)