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题目类型：[单选]
[单选] 月经的发生与下列哪种因素有关（ ）
A
血液中前列腺素的浓度降低
B
血液中孕酮和雌二醇水平下降
C
血液中孕酮水平升高，雌二醇水平下降
D
卵泡刺激素和黄体生成素水平升高
E
血中人绒毛膜促性腺激素浓度升高
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