The functions of Gamma-aminobutyric acid (GABA) can be described in terms of -

1. AExcitatory or inhibitory, involved in arousal, attention, memory
2. BMainly excitatory, involved in arousal and mood
3. CMajorly inhibitory involved in sleep and inhibitory movement
4. DInhibitory neural regulation, involved in pain relief

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Correct answer: C. Majorly inhibitory involved in sleep and inhibitory movement

Explanation

GABA is the main inhibitory neurotransmitter, involved in sleep and in inhibiting movement.