_____ is a state of unconsciousness produced by the body in which the brain is in a relative state of rest and is only reactive to internal stimulus

• A. Sleep
• B. Working
• C. Exercise
• D. None

Answer: (A)

Sleep is a natural, reversible unconscious state in which the brain rests and awareness of the outside world is reduced. In this state, you’re not aware of your surroundings and your body is at rest, with responsiveness primarily tied to internal signals rather than external ones. This description fits sleep, because the brain is resting and the person tends to react more to internal cues (like the body’s clock or internal needs) than to outside stimuli. Being awake and active, such as working or exercising, is not unconscious, so those options don’t fit.