题目：
下列调节红细胞生成的物质中，直接作用于祖细胞的有（）
A.雄激素
B.生长激素
C.促红细胞生成素
D.雌激素
E.爆式促进因子
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
下列调节红细胞生成的物质中，直接作用于祖细胞的有（） A.雄激素 B.生长激素 C.
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