问题：
[单选题]患者，男，50岁。因呕血、黑便3小时入院。查体:脉搏124次/分，血压80/50mmHg,四肢冷, 面色苍白。估计短期内出血量为
A、<200ml
B、200〜400ml
C、400〜600ml
D、600〜800ml
E、>800ml
参考答案：
E
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