Which assessment tool is commonly used to evaluate the level of consciousness in a neurologically impaired patient?

A. Numerical Rating Scale is used to assess pain intensity, not consciousness. B. Wong-Baker FACES is also a pain assessment tool, mainly for children. C. Visual Analog Scale measures subjective pain levels. D. Glasgow Coma Scale (GCS) is the standard tool used to assess a patient’s level of consciousness, evaluating eye opening, verbal response, and motor response.