【名词&注释】
阿托品(atropine)、舌下腺(sublingual gland)、颌下腺(submandibular gland)、感受器(receptor)、阻断剂(blocker)、卵圆形(ovoid in shape)、多形性低度恶性腺癌(polymorphous low-grade adenocarcinoma)
[单选题]多形性低度恶性腺癌(polymorphous low-grade adenocarcinoma)主要发生于
A. 腮腺
B. 颌下腺
C. 舌下腺
D. 腭腺
E. 唇腺