This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Characteristic features of opioid withdrawal is: \nSelect and explain. \nA. Rhinorrhea and lacrimation, B. Seizures, C. Delirium tremors, D. Transient visual, tactile or auditory hallucinations', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: KDT 6/e p447 *Withdrawal symptoms are opposite of the acute effect of drug. For opioids, these include lacrimation, rhinorrhea, lacrimation, yawning, piloerection, diarrhea, nausea, coughing, mydriasis, sweating and twitching of muscles.', 'role': 'assistant'}]