Which one depresses brain activity?

Which one depreses brain activity?

Which one depreses brain activity?

Which one depreses brain activity?

Drug which depresses brain activity and produces feeling of calmness, relaxation, drowsiness and deep sleep is :

Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?

Which one of the following depresses brain activity and produces feelings of calmness, relaxtion and drowsiness?

Which one of the following depresses brain activity and produces feelings of calmness, relaxtion and drowsiness?