The patient with a brain concussion experienced vertigo to the extent that he was unaware of his surroundings and unable to respond to stimuli. He was in a state of

Question

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The patient's inability to be aware of his surroundings and respond to stimuli indicates a loss of consciousness, making option A the correct choice. Option C (disorientation) and option D (incoherence) suggest that the patient is conscious and able to respond to some degree, which is not the case here.

The Patient with a Brain Concussion Experienced Vertigo to the Extent