This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following drug is NOT used for analgesia in a head injury patient? 
Select and explain. 
A. Morphine, B. NSAIDS, C. Rofecoxib, D. Acetaminophen
A: Morphine
Answer: A: Morphine 
Explanation: Morphine is contraindicated in patients with head injury and increased intracranial pressure. Like all narcotics, it may obscure clinical findings. The likelihood of respiratory depression and increased intracranial pressure is greater when morphine is given under these conditions. Morphine must be given with caution when administered to patients taking CNS depressants. Caution should also be used when morphine is required for older or debilitated patients or those with renal or hepatic impairment. It should be used with caution when given to patients who are sensitive to CNS effects because of concurrent alterations in their health status. Ref: Drug Therapy in Nursing By Diane S. Aschenbrenner, page 382.