Reflex action involves
a)	Spinal cord	b)	Cerebellum	c)	Medulla oblongata	d)	Optic fibre

(a)

Reflexes are classified as the spinal reflexes and the cranial reflexes. The former are so called because their basic neural path leads through spinal nerves and spinal cord. Reflexes at the spinal level have the purpose of removing the animal from harmful stimuli.