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【单选题】
关于呕血与便血的概念，下列哪些是错误的A.
呕血是指上消化道出血，血液经口腔呕出
B.
由鼻腔、口腔、咽喉部出血吞咽后再呕出,也称呕血
C.
便血的颜色可呈鲜红、暗红或黑色（柏油样）
D.
便血的病因可以为上消化道疾病，也可以为下消化道疾病所致
E.
消化道少量出血，粪便可无颜色改变
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