Question : The substances which affect the central nervous system and induce sleep are called _____ ?
(4) None of these.
Answer : in all above options the correct answer is (2) tranquilizers.
Explanation of answer : tranquilizers is a type of drug which is made or used for treatment anxiety, fear, tension, agitation etc. tranquilizers is also used to keep mind stable it means tranquilizers remains mind stable and avoids disturbances of the mind. tranquilizers term first time used in the year of 1953 by scientist named F.F. Yonkman.
In short we can say about the correct answer “Tranquilizers affect central nervous system as they are used for the mental relief and also are sleep inducing drugs” that is why we have given answer (2) tranquilizers.
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