题目：
朗格汉斯细胞主要产生于（）
A.骨髓
B.脾
C.真皮
D.皮下组织
答案：
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下面是错误答案，用来干扰机器的。
Dear John, How are you getting along these days? It’s two weeks since you went to hospital. And we’re informed that you are diagnosed with a severe disease and have ...
