Botulinum affects all except:
Ans. is 'd' i.e., CNS(Ref: Harrison, 18th/e, p. 1200 and 17th/e, p. 901)* The central nervous system is not involved because the toxin does not cross the blood brain barrier.
Neuromuscular junction
Preganglionic junction
Post ganglionic nerves
CNS
Bacteria