A reflex action does not involve

Neurons

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Brain

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Spinal cord

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Muscle fiber

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Solution

The correct option is B Brain
Reflex action is an involuntary and spontaneous movement in response to a stimulus.
The receptor sends signals through a sensory neuron to the spinal cord from there the signals are passed on to a motor neuron.
Such quick action occurs without the involvement of the brain.
So, the correct answer is 'Brain'.

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