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【单选题】
患者，女，20岁，急性扁桃体炎。表现为T38.9℃、咽痛、扁桃体肿大、充血、表面有脓点以及颌下淋巴结肿大。需青霉素治疗。使用青霉素前需做过敏试验，皮试液的浓度为每毫升（）
A.
5U
B.
10U
C.
50U
D.
500U
E.
2500U
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A.
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