This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Which of the following feature differentiates pethidine from morphine? \nSelect and explain. \nA. Local anaesthetic action, B. More analgesic action, C. More respiratory depression, D. Suppresses cough effectively', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In contrast to morphine, pethidine has following features 1/10 analgesic potency More rapid onset of action Shoer duration of action Not an effective cough suppressant Lesser spasmodic action on smooth muscles Local anesthetic action Less histamine relief - safer in asthmatics Higher oral; parenteral activity ratio Atropinic effects - dry mouth, blood vision Miosis, constipation Urinary retention are less prominent.', 'role': 'assistant'}]