This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
Morphine causes all, Except 
Select and explain. 
A. Peripheral vasodilatation, B. Decrease intracranial tension, C. Nausea and vomiting, D. Decrease in gastrointestinal secretion
B: Decrease intracranial tension
Answer: B: Decrease intracranial tension 
Explanation: Morphine is contraindicated in patients with head injury because 1. It causes increased intracranial tension. 2. Causes marked respiratory depression. 3. Causes vomiting, miosis and altered mentation that interfere with assessment of progress in head injury patients. Ref: KD Tripathi 8th ed.