<prompt> Inhibitory neurotransmitter of central nervous system is:AspartateGamma-aminobutyric acidGlutamateAcetylcholine  <response>: Ans. B. Gamma-aminobutyric acidGAMMA-AMINOBUTYRIC ACID is an inhibitory neurotransmitter found in brain and retina which is responsible for presynaptic inhibition. 