This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
Morphine can be used in all the following conditions except: 
Select and explain. 
A. Head injury, B. Asthma, C. Hypothyroidism, D. Diabetes
A: Head injury
Answer: A: Head injury 
Explanation: Ref: KDT 6/e p457 Head injury is an absolute contra- indication to morphine use. Hypothyroidism and asthma are relative contra indication.