This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
[{'content': 'Effects mediated by H1 histamine receptor include \nSelect and explain. \nA. Inhibition of gastric acid secretion, B. Induction of hepatic cytochrome P450 enzyme, C. Maintaince of a wakeful state, D. Vasoconstriction of aerioles', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The H1 receptor is a histamine receptorbelonging to the family of rhodopsin-like G-protein-coupled receptors.This receptor is activated by the biogenic amine histamine. It is expressed in smooth muscles, on vascular endothelial cells, in the hea, and in the central nervous system. Refer kDT 7/162', 'role': 'assistant'}]