单选题：回答题According to Hahn, the HIV epidemic originated in[A] Came

题目内容：

回答题

According to Hahn, the HIV epidemic originated in
[A] Cameroon.
[B] Kinshasa and Brazzaville.
[C] Congo River. 　　
[D] Nile River.

参考答案：

答案解析：

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