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: Medicine
Which beta 2 agonist is not given for acute bronchial asthma 
Select and explain. 
A. Salbutamol, B. Terbutaline, C. Salmeterol, D. Methyl xanthine
C: Salmeterol
Answer: C: Salmeterol 
Explanation: Long acting beta 2 agonists (Formoterol, Salmeterol, Arformoterol, Carmoterol) should not be used in case of acute asthma as monotherapy (increased mortality).