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
H1 antagonist has all the functions except : 
Select and explain. 
A. Antipruritic, B. Sedation, C. Decrease gastric acid secretion, D. Antivertigo
C: Decrease gastric acid secretion
Answer: C: Decrease gastric acid secretion 
Explanation: None