单选题肛裂病人在排便结束数分钟后再次出现持续疼痛的主要原因是（ ）。A直肠黏膜破损B大便干硬刺激C形成血栓性外痔D肛裂处神经末梢受刺激E肛管内括约肌痉挛性收缩
单选题
肛裂病人在排便结束数分钟后再次出现持续疼痛的主要原因是（ ）。
A
直肠黏膜破损
B
大便干硬刺激
C
形成血栓性外痔
D
肛裂处神经末梢受刺激
E
肛管内括约肌痉挛性收缩
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