<prompt> Nerve growth factor is required for growth of ?Sympathetic neuronsBrainMotor neurony-neuron  <response>: Ans. is a i.e., Sympathetic neuronsNerve growth factor NGF promotes growth of neurons, paicularly autonomic nervous system.Antiserum against NGF can be prepared and injection of this serum causes total destruction of sympathetic ganglia - immunosympathectomy.NGF is also required for growth of basal forebrain cholinergic neurons. 