问题：
[单选题]患者，女性，24岁，慢性特发性血小板减少性紫癜，反复出血。经泼尼松治疗7个月后症状无好转。治疗可采用（ ）。
A、改用地塞米松
B、输红细胞悬液
C、输全血
D、脾切除
E、应用止血药
参考答案：
D
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