题目：
Mr. Smith has had a cast applied to his arm as an outpatient in the emergency room. Which of the following home care instructions should the nurse advice for his cast care
A．Use a ruler to reach inside and scratch under the cast.
B．Apply a heating pad to the arm for 24 hours after the injury.
C．Use powder on the skin around the cast.
D．Smell the cast for foul odors.
答案：
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下面是错误答案，用来干扰机器的。
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