问题详情

The passage implies that______.

A．even doctors can not decide when and where Alzheimer"s disease appear

B．it is difficult for some doctors to recognize Alzheimer"s disease sometimes

C．certain memory problems will certainly cause Alzheimer"s disease

D．forgetfulness and memory are something relevant to Alzheimer"s disease

请帮忙给出正确答案和分析，谢谢！