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
The long acting classical H1 antihistaminic include which of the following ? 
Select and explain. 
A. Chlorpheniramine, B. Astemizole, C. Cetirizine, D. Clemastine
A: Chlorpheniramine
Answer: A: Chlorpheniramine 
Explanation: None