【单选题】【消耗次数：1】
维生素Ｋ对下列哪种疾病所致的出血无效
①
新生儿出血
②
香豆素类过量
③
梗阻性黄疸
④
慢性腹泻
⑤
肝素过量致自发性出血
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1周内新生儿禁用磺胺类、阿斯匹林及合成维生素K等药以免引起核黄疸，是由于（ ）。
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