题目内容：
In what way is memory related to hippocampus shrinkage?
A．There is no relation between memory and hippocampus shrinkage. B．The more hippocampus shrinks, the poorer one's memory.
C．The more hippocampus shrinks, the better one's memory.
D．The less hippocampus shrinks, the poorer one's memory.
参考答案：
答案解析：