This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following actions is not caused by H1 receptor - 
Select and explain. 
A. Vasocontriction, B. Gastric acid secretion, C. | Permeability, D. Bronchoconstriction
B: Gastric acid secretion
Answer: B: Gastric acid secretion 
Explanation: Ans. is 'b' i.e., Gastric acid secretion Gastric secretion is H2mediated.