Which of the following is an example of a reflex?

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Deciding to move your leg to stretch it

Voluntarily lifting your arm to scratch an itch

Blinking in response to a bright light

Smiling in response to a joke

answer is A.

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Detailed Solution

Normal blinking of the eyes is an involuntary action. The way the iris in our eye adjusts the size of the pupil in response to sudden bright or dim light is a reflex action under the control of the cerebrum.

Hence, the correct option is blinking in response to bright light.

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