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: Anatomy
Pethidine is pharmacologically different from morphine because it 
Select and explain. 
A. Causes more sedation, B. Causes more constipation, C. Has additional Anticholinergic action, D. Causes spasm of sphincter of Oddi
C: Has additional Anticholinergic action
Answer: C: Has additional Anticholinergic action 
Explanation: Uses of opioids IV morphine Myocardial infarction, Acute pulmonary edema Codeine, Pholcodeine, Dextromethorphan, Noscapine Cough suppressants Loperamide, Diphenoxylate Noninfective diarrhea Morphine Pre-anesthetic medication Pethidine Reduces shivering after anesthesia ( a2 receptor action) Methadone Neuropathic / Cancer pain Methadone Opioid abuse & Opioid rotation treatment (Refer: K. D. Tripathi&;s Essentials of Medical Pharmacology, 7th edition, pg no: 475)