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单项选择题

下列关于咯血的概念正确的是：

A、牙龈、口腔粘膜出血，不属于咯血
B、鼻出血多由前鼻孔流出，不属于咯血
C、经口腔排出的血，必须鉴别是咯血还是呕血
D、咯血是指喉及喉以下呼吸道任何部位的出血，经口排出者
E、鼻腔后部出血，经后鼻孔沿咽后壁下流，从口腔排出，也称咯血
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