This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
[{'content': 'Which of the following drugs do not act through the ion channel receptors \nSelect and explain. \nA. Nicotine, B. Insulin, C. Gliclazide, D. Diazepam', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Insulin acts through enzyme-linked receptor - tyrosine kinase acts through: gliclazide- potassium channels, nicotine-nicotinic acetylcholine channels, diazepam- GABA channels Ref: KD Tripathi 8th ed', 'role': 'assistant'}]