The following are true about the autonomic nervous system:
a. the preganglionic fibres are mainly myelinated, slow conducting B fibres
b. the postganglionic fibres are mainly unmyelinated C fibres
c. all preganglionic neurones are cholinergic neurons
d. all above
a. the preganglionic fibres are mainly myelinated, slow conducting B fibres
b. the postganglionic fibres are mainly unmyelinated C fibres
c. all preganglionic neurones are cholinergic neurons
d. all above