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 is antiasthmatic: 
Select and explain. 
A. Histamine, B. Salbutamol, C. Acetylcholine, D. Serotonin
B: Salbutamol
Answer: B: Salbutamol 
Explanation: None