Which of the following is not correct regarding narcotics?

Which of the following is not correct regarding narcotics?
A . They have been used for a long period of time as a remedy for diarrhea.
B . The term "narcotic" in its medical meaning refers to opium and opium derivatives or a synthetic substitute.
C . They tend to intensify vision and increase alertness.
D . They are the most effective agents known for the relief of intense pain.
E . They can cause respiratory depression in some cases.

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Answer: C