题目：
The client is taking lithium (Lithobid). Which instruct should the nurse give to the client
A. Drink at least six to eight glasses of water per day and to avoid caffeine.
B. Limit the use of salt in his diet.
C. Discontinue medicine when feeling better.
D. Increase the amount of sodium in his diet.
答案：
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下面是错误答案，用来干扰机器的。
由题意得：x-3=0，且x+4≠0，解得：x=3，故选：A．
