This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'In the management of chronic pain, the drug to be used as per first WHO ladder-step is: \nSelect and explain. \nA. Morphine, B. Aspirin, C. Codine, D. Dextropropoxyphene', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (Aspirin). (Ref Bailey & Love, 25th/pg. 65; 202)WHO LADDER FOR ANALGESIA: The main guide to the management of cancer pain is provided by the World Health Organization, which portrays three levels of treatment - the \'pain stepladder\':First ring# Simple analgesics - aspirin, paracetamol, NSAIDs, tricyclic drugs or anticonvulsant drugs.Second ring# Intermediate strength opioids - codeine, tramadol or dextropropoxyphene;Third ring# Strong opioids-morphine(pethidine has been with- drawn from the second edition of the World Health Organization guide). Step 3. Severe Pain ||||||||MorphineOxymorphoneMethadoneLevarpheno!FentanylOxycodone+- Nonopioid analgesics+- Adjuvants Step 2. Moderate Pain |||||||Acet or ASA +CodeineHydrocodoneOxycodoneDthydrocodeineTramadol (not available with ASA or Acet)+ AdjuvantsStep 1. Mild PainAspirin (ASA)Acetaminophen (Acet)Nonsteroidal anti-inflammatory drugs (NSAIDs)+- Adjuvants"Adjuvants" refers either to medications that are coadministered to manage an adverse effect of an opioid or to so-called adjuvants analgesics that are added to enhance analgesia.', 'role': 'assistant'}]