Correct option (b) simple reflex
Explanation :
The example given in the question is of simple reflex. A simple reflex is defined as a spontaneous, automatic and mechanical response to a stimulus acting on a specific receptor without the will of an animal. The action of the frog does not involve its u'ill as it is without a brain. When the leg of the decapitated frog (frog whose brain has been destroyed or removed) is pinched, the stimulus is received by a receptor in the skin. On receiving a stimulus. the receptor sets up a sensory impulse. The latter is carried to the spinal cord through the dorsal sensory root of a spinal nerve, i.e., sciatic nerve. The spinal cord transforms the sensory impulse into a motor impulse. The latter is transmitted to the leg muscles. The muscles (effectors) then contract and the leg is withdrawn to avoid the stimulus. Conditioned reflexes are those reflex actions that are not present at birth but develop later in life through learning, habit, experience or regular association of an indifferent stimulus with unconditioned stimulus.
