皮皮学，免费搜题
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【单选题】
19岁，未婚，原发性闭经，体型及容貌呈女性，乳房发育好，外阴未见异常，肛查子宫小细长，双附件正常，经黄体酮及雌激素试验均阴性，闭经原因是在( )。
A.
丘脑下部
B.
脑垂体
C.
肾上腺
D.
卵巢
E.
子宫
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