46 赫德威氏根鞘(Hertwig’s root sheath)是由下列何者形成？
(A)內與外牙上皮(inner and outer dental epithelium)
(B)齒濾泡(dental follicle)與牙乳頭(dental papilla)
(C)網狀星形細胞層(stellate reticulum)與內牙上皮(inner dental epithelium)
(D)網狀星形細胞層(stellate reticulum)與牙乳頭(dental papilla)

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統計： A(329), B(16), C(34), D(8), E(0) #2237083