Low doses of central nervous system (CNS) depressants produce an initial excitatory response. This reaction is caused by:
A. a stimulating effect on the CNS.
B. the depression of acetylcholine.
C. the stimulation of dopamine by depressant drugs.
D. inhibitory synapses in the brain being depressed before excitatory synapses.
Answer: D. inhibitory synapses in the brain being depressed before excitatory synapses.
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