This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Opioids, Subject name: Pharmacology
[{'content': 'Tolerance occurs to all side effects of Morphine, EXCEPT \nSelect and explain. \nA. Sedation, B. Constipation, C. Pain relieving, D. Euphoric effect', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Constipation High degree of tolerance develops to morphine and related opioids if the drug is used repeatedly.Tolerance develops to all the actions except constipating and miotic action.", 'role': 'assistant'}]