When a very bright light is incident on our eyes, we immediately close our eyelids. This is an example of _______.

Closing the eyelids at bright light is a reflex action, an automatic involuntary response.

Biological instincts (A) are inborn drives, broader than a single automatic response.

Desired instincts (C) is not a recognised category.

Intrapersonal instincts (D) is not a valid term here.

A reflex follows a stimulus through the reflex arc without conscious thought.

The blink to light is a protective reflex mediated by the brainstem.