Pain is thought of as a. a subjective experience that is difficult to measure objectively. b. associated with changes in vital signs reflecting its intensity. c. always the result of tissue damage that activates nociceptors. d. experienced in the same way by all individuals.

Option-A

Explanation:

Pain is an unpleasant feeling and emotional experience caused by some damage to the biological tissue or psychological damage.

The pain is experienced when the nerve ending of the specific pain receptors respond to the damage and produces a stimulus and the message is then transferred to the spinal cord.

McCaffery in 1968 defined pain as the subjective experience which has no objective measure.

Thus, Option-A is the correct answer.

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70 % i think is the answer.