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
[{'content': 'Morphine can be used in all the following conditions except: \nSelect and explain. \nA. Head injury, B. Asthma, C. Hypothyroidism, D. Diabetes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: KDT 6/e p457 Head injury is an absolute contra- indication to morphine use. Hypothyroidism and asthma are relative contra indication.', 'role': 'assistant'}]